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Since Intel X299 boards are coming out I thought it would be a good idea to start a thread to discuss the VRM on these boards since they are HEDT CPUs.

Thank you Nickshih from Asrock https://www.overclock.net/t/1632665/intel-x299-socket-2066-vrm-thread/380#post_26230356
Asrock X299 OC formula
Asrock X299 Professional Gaming I9
Asrock X299 Taichi

These 3 model use same 12 (Core)+ 1(VCCSA) phases

VCORE 12phase
ISL69138+ ISL6617*6 (pwm doubler) +ISL99227*12 (DrMOS)

VCCM 2phase on Both AB and CD channel .
ISL69138+ ISL9596*2 (driver) + FDPC5030SG*2 (dual-NMOS)

Asrock X299 Gaming K6
Asrock X299 Killer SLi

These 2 model use same 10 (Core)+ 1(VCCSA) phases

VCORE 10phase
ISL69138+ ISL6617*5 (pwm doubler) +ISL99227*10 (DrMOS)

VCCM 2phase on Both AB and CD channel .
ISL69138+ ISL9596*2 (driver) + FDPC5030SG*2 (dual-NMOS)

Asrock X299 E-Itx

VCORE 6phase
ISL69138 + ISL99227*6 (DrMOS)
VCCM 1phase
ISL69138+ ISL9596*1 (driver) + FDPC5030SG*1 (dual-NMOS)

So far X299 OC formula can handle 1000 watts loading by Cinebench R15 without any problems . It is confirmed on LN2

X299 OC formula (https://videocardz.net/mobo/asrock-x299-oc-formula , https://www.techpowerup.com/233819/asrock-x299-oc-formula-by-nick-shih-pictured) --- supposedly 13 phases 8+4 pin power Quote: Originally Posted by Nickshih

VCORE 12phase ISL69138+ ISL6617*6 (pwm doubler) +ISL99227*12 (DrMOS)
VCCM 2phase on Both AB and CD channel . ISL69138+ ISL9596*2 (driver) + FDPC5030SG*2 (dual-NMOS)

http://www.asrock.com.tw/mb/Intel/X299 OC Formula/index.asp
---> https://www.tweaktown.com/reviews/8365/asrock-x299-oc-formula-motherboard-review/index3.html

X299 Fatal1ty Professional Gaming i9 XE (8+8 pin CPU power)
---> 12 phase Intersil ISL99227 for CPU via ISL6617 doublers
---> https://www.tweaktown.com/reviews/8...o-gaming-i9-xe-motherboard-review/index3.html
--->12+1 ISL99227B per https://www.clubedohardware.com.br/...9-professional-gaming-i9-xe-r36801/?nbcpage=6

Fatal1ty X299 Professional Gaming i9 : 13 phase power design DrMOS (8 pin power) --- claims 720A , Newegg photos have 6 components on back of CPU VRM area suggesting 6 phases doubled http://www.intersil.com/content/dam/Intersil/documents/isl9/isl99227-27b.pdf
---> VCORE 12phase ISL69138+ ISL6617*6 (pwm doubler) +ISL99227*12 (DrMOS) ; VCCM 2phase on Both AB and CD channel . ISL69138+ ISL9596*2 (driver) + FDPC5030SG*2 (dual-NMOS) confirmed by Nickshih
---> Heatsink may be a bit skimpy for 10-core CPUs , see thermal imaging I found on livedoor , however the review at tweaktown has it as one of the coolest VRMs
---> http://www.tweaktown.com/reviews/82...pro-gaming-i9-motherboard-review/index10.html
The backside temperatures are possibly the best I have seen thus far, and this motherboard has the same VRm as the X299 Taichi. There might be a difference in the copper in the PCB and ambient temperature, but I was quite shocked that this board did slightly better, and the Taichi was one of the best boards I have tested thus far.

Read more: http://www.tweaktown.com/reviews/82...pro-gaming-i9-motherboard-review/index10.html

ASRock X299 Taichi XE (8+8 pin) --- 13 phase Smart Power stages, 65A chokes
---> http://www.xfastest.com/thread-201857-1-1.html
---> https://www.kitguru.net/components/...n/asrock-x299-taichi-xe-motherboard-review/3/
---> https://www.tweaktown.com/reviews/8480/asrock-x299-taichi-xe-intel-motherboard-review/index10.html

X299 Taichi : 13 phase power design DrMOS --- claims 720A (8 pin power)
---> supposedly same as the Fatal1ty Gaming i9 , results https://www.techpowerup.com/reviews/ASRock/X299_Taichi/8.html
---> https://www.hkepc.com/15182/解構_INTEL_X299_平台_ASROCK_X299_TAICHI_主機板/page/3#view
"Intersil ISL69138 PWM + ISL6617A phase doubler + 13 Intersil ISL99227B"
---> VCORE 12phase ISL69138+ ISL6617*6 (pwm doubler) +ISL99227*12 (DrMOS) ; VCCM 2phase on Both AB and CD channel . ISL69138+ ISL9596*2 (driver) + FDPC5030SG*2 (dual-NMOS) confirmed by Nickshih
---> http://www.tweaktown.com/reviews/8271/asrock-x299-taichi-motherboard-review/index3.html
---> http://www.gdm.or.jp/review/2017/0714/213855/3
---> http://yujihw.com/review/x299-i7-7800x-vs-ryzen51600
---> https://www.hkepc.com/15182/解構_INTEL_X299_平台_ASROCK_X299_TAICHI_主機板/page/3
---> http://www.hardwaresecrets.com/asrock-x299-taichi-motherboard/6/

X299 Fatal1ty Gaming K6 11 phase power design DrMOS (8 pin power)
--->VCORE ISL69138+ ISL6617*5 (pwm doubler) +ISL99227*10 (DrMOS) ; VCCM 2phase on Both AB and CD channel . ISL69138+ ISL9596*2 (driver) + FDPC5030SG*2 (dual-NMOS) per Nickshih
---> https://www.overclockers.ru/lab/879...koj-platy-asrock-fatal1ty-x299-gaming-k6.html

X299 Killer SLI ac:11 phase power design DrMOS (8 pin power)
---> ISL69138+ ISL6617*5 (pwm doubler) +ISL99227*10 (DrMOS) ; VCCM 2phase on Both AB and CD channel .
ISL69138+ ISL9596*2 (driver) + FDPC5030SG*2 (dual-NMOS) per Nickshih
---> compared to Fatal1ty K6, missing Debug Code LED
---> 63.8°C VRM temp with 4.6GHz i9-7900x , 1.258 V CPU volts / 253 W power output, https://www.techpowerup.com/reviews/ASRock/X299_Killer_SLI_ac/14.html
---> https://www.techbang.com/posts/53979-enter-hedt-value-for-money-tickets-asrock-x299-killer-sli-ac

X299 Extreme4 11 phase power design (8+8 pin CPU power)
---> "Dual Stack Mosfet" = Fairchild FDPC5030SG , be aware these are capable of 35A at 100°C and 56A at 25°C T_case so you can't push these as hard as Intersil 60A powerstages
---> heatpiped heatsink , rated for X series Intel CPUs
---> https://news.xfastest.com/review/43680/asrock-x299-extreme4/
---> https://www.tweaktown.com/reviews/8515/asrock-x299-extreme4-intel-motherboard-review/index3.html
---> FDPC5030SG Dual-N Mosfets per http://www.hkepc.com/16153
---> https://www.hardwareluxx.de/index.p...4-im-test-mit-ueberzeugendem-vrm-bereich.html
---> https://3dnews.ru/966590

Asrock X299M Extreme4

X299E-ITX AC (http://www.tweaktown.com/news/57771/asrock-x299e-itx-ac-up-12c-24t-cpu-power-form/index.html) --- 7 phases (8 pin power)
---> VCORE 6phase ISL69138 + ISL99227*6 (DrMOS) ; VCCM 1phase ISL69138+ ISL9596*1 (driver) + FDPC5030SG*1 (dual-NMOS) per Nickshih
---> https://smallformfactor.net/reviews/motherboards/asrocks-little-monster-x299e-itxac-reviewed

The VRM solution has 7 total phases, using VRMS marked as "23F 73AU"
---> https://news.xfastest.com/review/43080/asrock-x299e-itxac/
---> https://www.tweaktown.com/reviews/8404/asrock-x299e-itx-ac-motherboard-review/index3.html
---> https://www.kitguru.net/components/motherboard/ryan-martin/asrock-x299e-itx-ac-motherboard-review/3/
---> https://www.techpowerup.com/reviews/ASRock/X299-ITX_ac/3.html
---> http://www.hkepc.com/15714/最強ITX主機板_ASROCK_X299E-ITXac_主機板

Thank you elmor https://www.overclock.net/t/1632665/intel-x299-socket-2066-vrm-thread/140#post_26207921 (Click to show)https://www.overclock.net/t/1632665/intel-x299-socket-2066-vrm-thread/140#post_26207921

Solutions are all ASP1405 in 7/8-phase mode. Most are using 7/8x IR3555 (60A), except for the two TUF boards which use 7/8x IR3535 + BSG0812. Rating without considering thermals is 480A output (420A with 7 phases) for IR3555 based boards, and 400A/350A with BSG0812. VR_HOT is triggered at 105*C. Switching frequency is 500 KHz. The only difference between boards are the inductors and the heatsink solution. Prime X299-A/Strix X299-E/TUF X299 Mark2 have 7 phases for VCCIN, Prime X299-Deluxe/TUF X299 Mark1 have 8 phases.

Nothing new here, same VRMs as on the X99 models. You can check der8auer's video on what to expect from the heatsinks, about 250W continuous on Prime X299-A/Strix X299-E Gaming/Prime X299-Deluxe. TUF X299 Mark1 is slightly better because the backplate helps dissipate the VRM heat (5-10*C lower at same output). That's inside a case with minimal airflow and stressing the GPU at the same time. Rampage VI Apex is capable of 340W continuous output due to an improved heatsink design.

Rampage VI Extreme Omega (8+8 pin power)
* 16x IR3555 for CPU
--> post by elmor: https://www.overclock.net/forum/27796112-post1193.html

ROG RAMPAGE VI EXTREME (8+4 pin power)
* 8x IR3555 for CPU
---> https://www.pcaxe.com/hardver/maticne-ploce/asusrampageviextreme/strana-5
---> https://www.gamersnexus.net/guides/3113-asus-rampage-vi-extreme-vrm-thermals
---> https://www.overclockers.ua/motherboard/asus-rog-rampage-VI-extreme/all/
* heatpiped heatsink

ROG RAMPAGE VI APEX (8+8 pin power)
* 8x IR3555 per der8auer , also decent heatsinks
---> http://www.coolenjoy.net/bbs/review/517449?p=4
---> https://www.hkepc.com/15791/X299_OC_戰神登場_ASUS_ROG_Rampage_VI_APEX_主機板

PRIME X299 DELUXE "ASUS DIGI+ VRM: 10 Phase digital power design" 8+4 pin power
---> unheatsinked at https://www.profesionalreview.com/2017/06/19/asus-prime-x299-deluxe-review/ , 8 CPU phases IR3555
---> https://www.chiphell.com/article-18145-3.html (thank you br0da)
---> http://greentechreviews.ru/2017/06/26/obzor-materinskoj-platy-asus-prime-x299-deluxe/ 8x IR3555 (thank you br0da)
--> http://www.tweaktown.com/reviews/8256/asus-prime-x299-deluxe-motherboard-review/index3.html
--> https://www.anandtech.com/show/12194/the-asus-prime-x299-deluxe-motherboard-review/2

PRIME X299 DELUXE II --- finned heatsink (8+8pin CPU power)
* "ASUS DIGI+ VRM: 12 Phase digital power design" (12x IR3555)
--> https://techreport.com/review/34295/asus-prime-x299-deluxe-ii-motherboard-reviewed/4

--> http://blog.livedoor.jp/wisteriear/archives/1073304650.html

WS X299 PRO/SE (8+8 pin CPU power)
---> "Digital 8 Phase CPU Power Design"
---> "Consisting of an ultra-efficient VRM heatsink with a metal fin array design that maximizes surface area for heat dissipation, plus two additional heatsinks and a connecting heatpipe to further increase cooling performance"

WS X299 SAGE (8+8 pin CPU power)
---> "Digital 8 Phase CPU Power Design" , heatpiped heatsink
---> 8 x IR3555 (http://www.pctekreviews.com/Reviews/WS_X299_SAGE.aspx)
---> 8 x IR3555 https://www.ixbt.com/platform/asus-ws-x299-sage-review.html

WS-X299-PRO (8+8 pin CPU power)
---> "Industry leading Digital 8 Phase CPU Power Design" , heatpiped heatsink
---> 8x IR3555 per https://nl.hardware.info/product/421279/asus-ws-x299-pro/specificaties

TUF X299 MARK I 8+4 pin power
---> ASUS asset https://dlcdnimgs.asus.com/websites/global/products/j4qTRJGV3gah8xP2/img/2D.png
----> 8x BSG0812 per elmor
---> missing Debug Code LED but has phone app that connects via bluetooth for debugging (TUF Detective 2)
---> https://news.xfastest.com/review/review-focus/39209/硬派電競裝甲風-耐用可靠超一流-asus-tuf-x299-mark-1-評測/4/

ROG STRIX X299-XE-GAMING 8+4 pin power
--> supposedly the X299-E GAMING with better VRM heatsink
--> https://ru.gecid.com/mboard/asus_rog_strix_x299-xe_gaming/
--> https://www.ixbt.com/platform/asus-rog-strix-x299-xe-gaming-review.html

ROG STRIX X299-E GAMING 8+4 pin power<--- appears to be 8 power phases
---> http://www.coolenjoy.net/bbs/review/486241?p=5 7 x IR3555 + 1 unknown (thanks arrow0309)
---> https://ru.gecid.com/mboard/asus_rog_strix_x299-e_gaming/?s=all

Prime X299-A 8+4 pin power
---> http://www.coolenjoy.net/bbs/review/486238?p=3 7x IR3555 + 1 unknown (thanks arrow0309)
---> https://www.ixbt.com/mainboard/asus/asus-prime-x299-a.shtml
---> https://www.ocaholic.ch/modules/smartsection/item.php?itemid=4111&page=3

TUF X299 MARK II 8+4 pin power <--- appears to be 8 phases
---> ASUS assets https://dlcdnimgs.asus.com/websites/global/products/ItH9TPzhXexDnavt/img/2D.png
----> Infineon OptiMOS 5 BSG0812ND (thanks br0da) https://www.overclock.net/t/1632665/intel-x299-socket-2066-vrm-thread/380#post_26230589
---> http://www.hw-journal.de/testberichte/mainboards/3108-asus-tuf-x299-mark-2-test?showall=&start=3
~~~~~~> same mosfet as ROG Maximus VIII Extreme & Z170I Pro Gaming , believed to be 50A rating
---> missing Debug Code LED but has a phone app that connects via bluetooth for debugging (TUF Detective 2)

X299 SOC CHAMPION (found via http://hwbot.org/hardware/motherboard/x299_soc_champion/)

X299X AORUS XTREME WaterForce : 16x Infineon TDA21472 via 8x IR3599 (8+8 pin CPU power), watercooled VRM + CPU (monoblock) , thermal base plate
X299X DESIGNARE 10G : 12x Infineon TDA21472 via 6x IR3599 (8+8 pin CPU power) , finned heatpiped heatsink, thermal base plate
X299X Master : 12x Infineon TDA21472 via 6x IR3599 (8+8 pin CPU power) , finned heatpiped heatsink, thermal base plate

X299-WU8 8x PowIRStages , finned heatsink

X299 AORUS MASTER (8+8 pin CPU Power)
---> 12x powerstages suspected to be IR3575 or ISl9927B exposed top powerstages , has finned heatpiped heatsink and thermal base plate
---> http://www.xanxogaming.com/reviews/...espanol/#Foto_de_Thermal_Pad_pads_disipadores
--> (used as test bed) https://www.kitguru.net/components/...9-9980xe-extreme-edition-this-cpu-hertz-me/4/

X299 AORUS-Gaming 9 3rd gen PowIRStages with Isense, turbo B clock 8+8 pin power
---> http://www.gamersnexus.net/news-pc/2932-gigabyte-x299-gaming-9-motherboards "8-phase IR3556 MOSFETs, with 2x VDDR IR3556"
---> http://www.tweaktown.com/reviews/8260/gigabyte-x299-aorus-gaming-9-motherboard-review/index3.html Quote: both main memory VRMs using two IR3553 PowIRstages and an IR35204 each.

X299 Designare EX (8+8 pin CPU power)
---> 12x ISL9227B Smart Power stages with heatpiped heatsink
---> https://www.tweaktown.com/reviews/8...nare-ex-intel-motherboard-review/index10.html
---> https://nl.hardware.info/reviews/79...xe-en-stijl-specificaties-en-bios-screenshots

X299 AORUS Gaming 7 Pro (8+8 pin CPU power)
---> 12x ISL99227B with heatpiped heatsink
---> https://www.tweaktown.com/reviews/8...s-gaming-7-pro-motherboard-review/index3.html Quote: The motherboard has changed from a true 8-phase PWM controller and VRM with 50A power stages to a 12 phase (6 doubled correctly to 12) with 60A power stages. That is more than doubling the output capability of the MOSFETs. The new Intersil ISL69138 true digital PWM controller from Intersil is in a 6+1 phase configuration. The last +1 is for the VCCSA and is on the far right side. Each power stage uses an ISL99227 Smart Power Stage, which is rated 60A, has internal current and temperature sensors, and offers double-sided cooling capacity (bottom through PCB and top through a metal area).
---> https://www.hardwareluxx.de/index.p...ng-verbesserungen-fuer-skylake-x.html?start=1

X299 AORUS Gaming 7 3rd gen PowIRStages with Isense, turbo B clock 8+8 pin power
---> supposedly the same VRM as the Gaming 9 : 8 x IR3556 for VCORE per http://www.gamersnexus.net/news-pc/2932-gigabyte-x299-gaming-9-motherboards
---> https://www.profesionalreview.com/2017/06/19/gigabyte-aorus-x299-gaming-7-review/
---> http://www.tweaktown.com/reviews/8274/gigabyte-x299-aorus-gaming-7-motherboard-review/index3.html
---> http://zhizhizhi.com/a/vt2b/
---> http://yujihw.com/review/x299-i7-7800x-vs-ryzen51600/3
---> http://www.hw4all.com/test-review-gigabyte-x299-aorus-gaming-7/
The power of the LGA2066 processor provides nine phases, eight of which are allocated to the voltage of the CPU VRIN. The ninth phase is for the CPU System Agent. Gigabyte has installed eight high-quality PowIRstage MOSFETs such as IR3556M and one IR3553M.
---> http://www.hardwaresecrets.com/gigabyte-x299-aorus-gaming-7/

X299 AORUS Ultra Gaming Pro (8+8 pin CPU power)
---> "Smart Power Stage controllers" (8x going by http://playwares.com/pcreview/55301209#)

X299 AORUS Ultra Gaming turbo B-clock + 3rd gen PowIRStages (8+8 pin power)
---> https://www.modders-inc.com/gigabyte-x299-aorus-ultra-gaming-motherboard-review/2/
---> missing Debug Code LED

X299 AORUS Gaming 3 Pro = 8x ISL99227B (8 pin CPU power)
---> http://quasarzone.co.kr/bbs/board.php?bo_table=qc_qsz&wr_id=94276

X299 AORUS Gaming 3 3rd gen PowIRStages with Isense, turbo B clock (8 pin power)
---> http://www.pceva.com.cn/article/3416-1.html (thank you br0da) "8+1" = 8x IR3556 50A , 1x IR3553
---> https://www.kitguru.net/components/...yte-x299-aorus-gaming-3-motherboard-review/3/
---> missing Debug Code LED

X299 UD4 EX (8 pin CPU power)
---> "Smart Power Stage controllers"

X299 UD4 Pro (8 pin CPU power)
---> "Smart Power Stage controllers"

X299 UD4 turbo B-clock + PowIRStages (8 pin power)
Likely 7 phases +1.
---> missing Debug Code LED

Gigabyte X299 Aorus Gaming (Kaby Lake X only)
---> http://www.coolpc.com.tw/phpBB2/viewtopic.php?f=70&t=242155&sid=9591aec29ef05ffdc33b8feb47e79f1c
---> https://news.xfastest.com/review/review-focus/41171/gigabyte-x299-aorus-gaming-kaby-lake-x-review/ (thanks asdkj1740)
8phases total for CPU with a 4+3 ISL PWM driving ON semi 4C06N as lowside and 1x ON semi 4C10N


Creator X299 ---- "12 phases 90A digital power DrMos" (8+8+8 pin power)

X299 Xpower Gaming AC (found via hwbot) ---- " 14-phase (12+1+1) DigitALL VRM with DrMOS" (8+4 pin power)

---> 6 doublers on back of board
---> [URL]http://blog.livedoor.jp/wisteriear/archives/1068873524.html

---> 12+1 IR3555 via doubler https://www.tweaktown.com/reviews/8353/msi-x299-xpower-gaming-ac-motherboard-review/index10.html
---> http://www.hw-journal.de/testberich...-x299-xpower-gaming-ac-test?showall=&start=10

X299 MEG Creation : "14 phases" = 12 CPU phases? 8+8 pin CPU power

---> https://www.techpowerup.com/248480/msi-intros-x299-meg-creation-motherboard
---> http://blog.livedoor.jp/wisteriear/archives/1073334359.html

X299 GAMING M7 ACK "12 phase power design" with OC engine 2 8+4 pin power
--> 11 IR3555 at CPU socket area , supposedly 5 phases doubled to 10 https://www.overclock.net/t/1632665/intel-x299-socket-2066-vrm-thread/140#post_26207921
---> http://www.tweaktown.com/reviews/8290/msi-x299-gaming-m7-ack-motherboard-review/index.html
---> https://www.overclockers.com/msi-x299-gaming-m7-ack-review/ (thanks br0da)
---> https://www.kitguru.net/components/.../msi-x299-gaming-m7-ack-motherboard-review/3/
---> http://www.hw-journal.de/testberichte/mainboards/3084-msi-x299-gaming-m7-ack-test?showall=&start=3

X299 GAMING PRO CARBON AC "12 phase power design" with OC engine 2 8+4 pin power
---> https://www.chiphell.com/article-18144-3.html (thank you br0da) --- IR35201 PWM driving some sort of integrated driver mosfet such as IR3555 ... 11 of them at CPU socket area
---> http://lab501.ro/placi-de-baza/prezentare-msi-x299-gaming-pro-carbon-ac/4 --- has 5 components at back of CPU area , probably 5 doublers?
---> http://www.coolenjoy.net/bbs/review/486240?p=4
---> http://www.tweaktown.com/reviews/8258/msi-x299-gaming-pro-carbon-ac-motherboard-review/index.html Quote: five true phases are doubled to 10. The IR35201 is being used in 5+1 phase mode, with the +1 being used for VCCSA, that is why you count 11 chokes in the image above.
Both memory VRMs use Primarion PV4210 digital PWMs, Primarion is owned by Infineon just like IR. Each memory phase uses two 25A/40A NexFETs, the CSD87350Q.

---> marketing material off the X299 Pro Carbon page https://asset.msi.com/global/picture/image/feature/mb/X299/X299-Carbon/DDRx299.png
--> https://www.ocaholic.ch/modules/smartsection/item.php?itemid=4092&page=3 Warning: Spoiler! (Click to show)The MSI X299 Gaming Pro Carbon AC comes with a digital 8+2+2 phase power design. The CPU is backed up by eight phases and the memory receives stable current supply from 2 phases for four banks each. The CPU power design is controlled by an IR35201 dual-loop multi-phase buck controller, which has 8 output phases. Every single phase is backed up by an IOR 3555M driver from International Rectifier as well as one inductor. These IOR 3555M MOSFETs are capable of dealing with up to 60A output current per phase, which makes the power design of this board highly capable. On each side of the CPU socked the four DIMM slots are controlled by a 2-phase VRM controller from ROHM Semiconductor.
--> https://www.overclockers.ru/lab/886...oj-platy-msi-x299-gaming-pro-carbon-ac.html#5

X299 TOMAHAWK ARCTIC "10 phase power design" with OC engine 2 (8 pin power)
---> 4 phases doubled to 8 : 2x NIKOS PK616BA+ 2x PK632BA on front and back https://www.overclock.net/t/1632665/intel-x299-socket-2066-vrm-thread/140#post_26207921
---> https://ockd.es/review-analisis-msi-x299-tomahawk-artic/4/
---> https://www.modders-inc.com/msi-x299-tomahawk-arctic-motherboard-review/2/
---> not suitable for HEDT due to backside VRM mosfet components

X299 TOMAHAWK " 10 phase power design" with OC engine 2 (8 pin power)
---> not suitable for HEDT due to backside VRM mosfet components
---> https://www.overclockers.ru/lab/886...materinskoj-platy-msi-x299-tomahawk-ac.html#5

X299-SLI-PLUS OC engine 2 (8 pin power)
---> backside NIKOS mosfets http://www.expreview.com/55446-2.html
---> not suitable for HEDT due to backside VRM mosfet components
----> http://yujihw.com/review/x299-i7-7800x-vs-ryzen51600/5 (PK616BA+PK632BA mosfets)

X299 Raider (source: Newegg) (8 pin CPU power)
---> missing Debug Code LED
----> not suitable for HEDT due to backside VRM mosfet components

X299M Gaming Pro Carbon AC (8 pin CPU power) --- backside mosfets
----> https://www.kitguru.net/components/...9m-gaming-pro-carbon-ac-motherboard-review/3/
MSI's VRM is powered by an International Rectifier IR35201 digital PWM controller with Nikos PK632BA and Nikos PK616BA MOSFETs. There are 9 pairs of these MOSFETs on the top each with its own Choke. Underneath is another 8 pairs of PK616BA and PK632BA MOSFETs as well as four IR3598 dual MOSFET drivers.
----> not suitable for HEDT due to backside VRM mosfet components

GT9 (https://videocardz.net/mobo/biostar-x299-racing-gt9/ , http://www.guru3d.com/news-story/computex-2017-scoop-biostar-racing-x299-gt9.html) ---- "14 phases"

151-SX-E299-KR / EVGA X299 DARK "14 Phase Digital VRM" (8+8 pin power)
---> http://www.gamersnexus.net/news-pc/2930-evga-x299-motherboards-in-depth-dark-micro-ftw-k Quote: EVGA has overhauled its power solution for the X299 DARK board, using an 8-phase core VRM with 1-phase VCCIO and 1-phase VSA. The VRM uses Intersil ISL69138 + ISL99227B MOSFETs for Vcore and VCCIN, with ISL69138 & ISL99140 for the VSA. International Rectifier is the choice supplier for VCCIO (IR35204 & IR3556), and ISL66133 & ISL99227 2-phase x2CH for VDDR. As for other changes, the X299 DARK motherboard uses EVGA's newest BIOS - which has gone through a bit of an overhaul since X99.

142-SX-E297-KR / EVGA X299 FTW K "14 Phase Digital VRM" (8+8 pin power)
---> http://www.gamersnexus.net/news-pc/2930-evga-x299-motherboards-in-depth-dark-micro-ftw-k Quote: 8-phase Vcore. EVGA is running some of the same ISL parts for this motherboard as on the DARK board, opting for an 8-phase Vcore that is identical to the DARK, with a 1-phase VSA and 1-phase VCCIO, also identical to the DARK. Actually, the VDDR VRM is also the same as the DARK - this board uses the same VRM, just different visual and DIMM configurations for a lower cost market.

131-SX-E295-KR / EVGA X299 Micro "12 phases Digital VRM" (8 pin power)
---> http://www.gamersnexus.net/news-pc/2930-evga-x299-motherboards-in-depth-dark-micro-ftw-k Quote: 8-phase Vcore/VCCIN with IR35201 & IR3556 MOSFETs). The VSA uses an IR35201 & IR3556 single-phase design, with VCCIO using IR35204 & IR3556 single-phase. VDDR is also single-phase x2CH, running IR35204 & IR3556 components.


VRM heatsinks lacking, plan accordingly
Quote: Originally Posted by Silicon Lottery

I am having trouble with some of these X299 motherboards. I've bought a wide variety for this launch, and none of them are really handling the load of an overclocked 7900X as well as I'd expect. VRM temps through the roof and boards throttling.
EK Monoblocks planned for ASUS STRIX E GAMING / STRIX XE GAMING / DELUXE / X299-A, Gigabyte Gaming 7 / Gaming 9 / Ultra Gaming , MSI Pro Carbon / M7.
Nov 16 update: EK has also announced monoblocks for ASRock X299 OC Formula, ASRock X299 Taichi , ASRock Fatal1ty X299 Professional Gaming i9 , ASRock X299 Killer SLI/ac , ASRock Fatal1ty X299 Gaming K6.

Bitspower has blocks for Asrock X299 Taichi / OC Formula / Killer / K6 (https://www.facebook.com/Bitspower/posts/1463828430350436) as well as the X299E-ITX/ac.

Nov 23 update: Bitspower now has blocks for Asus x299 TUF Mark 1 , Mark 2.

(Will update as reviews flow in.)
* June 20 , put up links to some reviews for ASUS X299 Prime Deluxe , MSI X299 Pro Carbon
* June 21 update , formatted motherboard name links to save space / improve format, also added TUF MARK I & MARK II marketing photos that hint at parts used , added link for Gigabyte X299 Gaming 9 preview

* June 22 update, updated Asrock X299E-ITX per Duality92
* June 28th update , add VRM heatsink caveat
* July 7 update , add the mosfet used for Fatal1ty i9 / Taichi , ASUS boards update based on elmor's info
* July 8 update , add power connector info + elmor's MSI x299 info
* July 12 update: add Rampage VI Apex info
* July 16 update: add Gigabyte X299 SOC CHAMPION and MSI XPower boards , update with hkepc Taichi review , add GamersNexus "preview" of EVGA boards
* July 18 update: add NickShih's Asrock info , TUF Mark 2 info
* July 24 update: add X299 SLI Plus info
* July 25 update: add tweaktown reviews for X299 Taichi + X299 Gaming 7
* July 30 update: add another source for Tomahawk Arctic VRM
* Aug 1 update: FLIR thermal images from livedoor for some boards indicate Asrock heatsink is not suitable for 10 cores (see post)
* Aug 4 update: add tweaktown reviews for Asrock Fatal1ty x299 i9, MSI x299 M7
* Aug 6 update : Added note on boards lacking debugging Code LED or other such features
* Aug 8 update: Update TUF Mark I and elmor quote
* Aug 29 update: X299 Aorus Ultra Gaming & Gigabyte X299 Aorus Gaming update, thanks br0da
* Sept 2 update: X299 Fatal1ty K6 update (thanks br0da)
* Sept 13 update: ROG STRIX X299-XE-GAMING
* Sept 19 update: add ROG APEX review (thanks br0da) , add TPU Asrock Killer SLI review
* Sept 25 update: add another GB x299 AORUS Gaming review (thanks asdkj1740)
* Oct 25 update : add X299-E ITX review from SFF Network
* Oct 27 update : add X299 Taichi XE review from Xfastest
* November 11: add Tweaktown OC Formula review , Killer SLI review from techbang , Extreme4 entry , WS X299 Pro entry
* Nov 12 update: add Gigabyte "Pro" boards , Asrock X299 Fatal1ty Professional Gaming i9 XE
* Nov 13 update: add RVI Extreme confirmation from pcaxe
* Nov 16 update: add EK monoblock info for Asrock boards
* Nov 17 update: add Asus WS X299 PRO/SE board , SAGE ; gecid review of Rampage VI extreme ; overclockers.ru K6 review
* Nov 19 update: added reviews from hw-journal.de
* December 1 update: tweaktown GBT Gaming 7 Pro review , kitguru Taichi XE
* December 6 update: add Xfastest review for Asrock X299 Extreme4
* January 11 2018: update add Kitguru review for X299E-ITX
* Jan 18 update : add Taichi XE & Designare EX reviews from tweaktown
* Feb 14 update: add x299 Extreme4 review from Tweaktown
* Feb 16 update: add MSI x299m Gaming Pro Carbon ac review , fixed formatting somewhat after forum changed to vbulletin but it is not 100% fixed
* Feb 26 update : add Asus WS x299 sage review from pctekreviews
* Mar 2 update: add another Fatal1ty i9 XE review from clubedohardware , ixbt WS x299 SAGE review
* Mar 12-13 updates: add Asrock Extreme4 review (hardwareluxx ru , 3dnews ru) , Taichi review (hardwaresecrets) , Xpower review from livedoor & hardwarejournal & tweaktown
* April 4 update: add Rampage VI extreme review from overclockers.ua
* Oct 30 update: add ASUS Prime X299 Deluxe II entry , MSI Creation, GBT X299-WU8
* Dec 28, 2018 update: add ASUS Deluxe II information and AORUS x299 Master information
* Jan 16,2019 update : add Asus ROG Rampage VI Extreme Omega information per elmor
* Jan 30, 2019 update: add MSI MEG Creation review from livedoor jp

When things are sort of finalized I think I will try to make a table of some sort. OCN doesn't have wiki-style formatting for tables, unfortunately.

br0da currently has it in table form on hardwareluxx: https://www.hardwareluxx.de/community/f12/lga-2066-mainboard-vrm-liste-1167715.html

The TL;DR version is don't buy MSI's x299 Tomahawk, SLI PLUS , or Raider : a VRM monoblock can't help with lower efficiency mosfets with no built-in thermal monitoring heating up on the back of motherboard. IR3555 / ISL99227B have built-in thermal monitoring and protections such as OCP/OVP.

250 Posts

⤷ αC
11,278 Posts
Discussion Starter · #3 ·

250 Posts
Looks like integrated voltage regulators like those from Haswell, doesn't it?
Just ~1.8V VCCIN from the bucks on the motherboard and all those different voltages get generated internally.

Edit: Ah, it was already exactly the same for Haswell-E, nevermind.

(That's for Haswell-E)

Gaming Overclocker
2,063 Posts
Check this Korean review out:


It has a lot of hires pics of the 3 X299 mainboard's vrm (Asus X299 A Prime, Rog Strix and MSI X299 PRO Gaming Carbon AC)

So yeah, looks like 8 phases for the both A Prime and Strix (with 8 IR3555) and sharing the same (Asus rebranded?) pwm.
Same IR3555M (11) and an IR35201 pwm for the MSI Gaming Pro Carbon.
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Reactions: AlphaC

Premium Member
8,227 Posts
They're not, zoom in, you can see the white silk screen squares on the motherboard for the chokes.

The daughter board is exclusively for SATA / USB. Why else would've they made it removable?

The heatsink for the VRM serves as a bracket for this daughter board so it stays in place too.

In the picture, you can see the heatsink goes all the way to the other side, so nothing can be soldered from the mainboard, onto the daughterboard.

See that gap under the daughterboard?


Premium Member
13,266 Posts
I said they sit under the daughter board.

I have the X299 Deluxe, Aorus Gaming 9, Aorus Gaming 7, and MSI gaming Pro Carbon. When I take pics I will share with you exactly what they have.

As for the iVR, it does have an iVR, but it's technically not a FIVR since not all rails are integrated like haswell. It does use the same voltage range and produce the same heat tho.

250 Posts
ASUS ROG Strix X299-E Gaming:

That's quite interesting: An ASP1405I which most likely is an IR35201 seems to run in 7+1 mode to control two different buck converters.
Of course the one with seven phases and those IR3555M PowIRstages is for VCCIN but what's the one phase with the CSD97374M NexFET for?
Sin are you allowed to tell us which voltages aren't generated internally from VCCIN?

Edit: Just found your article here: http://www.tweaktown.com/news/58013/intels-skylake-use-integrated-voltage-regulator/index.html
Reading the document from Intel my conclusion is that besides VCCIN there are three different voltages the board has to supply: VCCSA, VCCIO and VCC33 while VCC33 most likely is just 3.3V from the power supply.
But still VCCSA and VCCIO needs to get generated on the board and that could be done by either buck converters or linear regulators I'd say.

782 Posts
I like Taichi the most. BIOS look good without the concerning buggy ones shown in many reviews. VRM quality looks excellent with Dual LANs and a Wireless NIC.

Techspot used one in their review and it performs pretty damn well:

Biggest problem is availability. Only Newegg have a preorder for it. Amazon only have Asus boards, and the Gigabyte boards are removed for some reason.

1,985 Posts
This time ASUS have very strong X299 line and EVGA have X299 Dark very attractive motherboard and stand out from other definitely.
But ASUS domination is obvious with two premium models Rampage VI Apex and Rampage VI Extreme.
But that's not everything, their X299 Deluxe is nicer than ever before, I never liked that series somehow but this time is REALLY nice even with color I don't like.
This is not complete ASUS X299 line, they will launch at least one premium motherboard and that ASUS X299 WS probably for i9 series 10-18 cores.
I only could imagine that monster in E-ATX format.

I would go on successor of mine Rampage VI Extreme off course.
VRM is probably very similar to X99 RVE with little changes maybe.
We still need to see naked ASUS ROG motherboards but no reason to suspect in their 8 phases for CPU if they decide to repeat as X99 or 10 phases.
From other side if someone want to experiment with fastest DDR4 kits on 4 x DIMM slots maybe is better to go with Apex.
8+8 pin and 4 DIMM slots looks like ASUS choose that board to enthusiasts OC on LN2 more than RVIE.
RVIE looks more like board for 64-128 GB DDR4 and probably will support even i9 series with BIOS update later.

250 Posts
Roman Hartung aka der8auer just shared some knowledge in the german hardwareluxx forum:

"As far as I can see it's more about the heatsinks than the phasecount. Fun fact: All the boards I've tested so far stayed cooler without their heatsinks and some airflow than with their heatsinks on. Unfortunately the manufacturers do more care about design than efficiency and that's a huge mistake. The ASRock board you've mentioned [ASRock X299 K6 Gaming] should reach it's limits pretty soon [The guy want's to overclock to 4.5GHz] . The single 8 Pin connector also is a reason for that. I'd generally recommend you to go with a board with more than a single 8 Pin power connector if you're interested in overclocking."

"I've just tested the Gigabyte X299 Aorus Gaming 3 and at 4.3 GHz with 1.15V I already measured 105°C at the backside of the voltage regulators... You can guess what the temperature will be with 4.5 GHz at 1.25V or even higher overclocking.

[today] I'll test the MSI X299 Gaming Pro Carbon and the X299 SLI Plus. As far as I can see there's not a single board I'd recommend you for heavy overclocking. My first APEX sample had troubles with 5GHz and wasn't able to handle these clockspeeds at higher load. But ASUS listened to my feedback and reworked their cooling design completely and also they're using better thermal interface pads now.

The 400 € ASUS Prime X299-Deluxe wasn't even able to handle 4.8GHz.
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