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.
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.
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"
X299 AORUS Gaming 7 Pro(8+8 pin CPU power)
---> 12x ISL99227B with heatpiped heatsink
---> https://www.tweaktown.com/reviews/84...ew/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).
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.
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
151-SX-E299-KR / EVGA X299 DARK "14 Phase Digital VRM" (8+8 pin power)
---> http://www.gamersnexus.net/news-pc/2...rk-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/2...rk-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/2...rk-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.
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.
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.
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.