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Meeeeeeeow!
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There doesn't seem to be an X99 VRM discussion thread yet, so I guess now may be a good time to start one:

(This is just a draft and I will need to make greater details later on including pictures) Ocaholic has some extensive pictures, as do a few other sites.

Most motherboards are using 8x IR3550.

Also, I will update - Sin0822 has been doing reviews on Tweaktown and has begun using a thermal camera to test out the VRM temperatures on motherboards:
http://www.tweaktown.com/author/Steven-Bassiri/index.html

Thanks to
AlphaC for multiple motherboard contributions
Sin0822, likewise for multiple contributions, particularly with Gigabyte's motherboards

Astr627 for image on MSI X99 Krait

Motherboard makers (in alphabetical order):
Asrock
Asrock has been marketing their Mosfets as "dual stack". Not entirely sure what that means.

For Z97, that meant they used NextFET D87350s, but I think they may have swapped over to Fairchild Semi.

They are using 60A Blackwing chokes, which might be overkill for what Mosfets are being used. Unlike other manufacturers, their boards seem to come with Nichicon 12K Platinum Caps standard versus most others using 10k.

ASRock Fatal1ty X99M
Mosfets: 12x FDMS3660S (see: https://www.fairchildsemi.com/products/discretes/fets/mosfets/FDMS3660S.html)
Controller: ISL6379 Hybrid Digital/Analog
Choke?

X99 WS
Mosfets: 24x D87350? Edit: These might be Fairchild Semi?
Choke: 60A Blackwing
Controller: ISL6379 Hybrid Digital/Analog
Mosfets:

Hybrid Controller ISL6379:

X99 OC Formula
Mosfets: 12x FDMS3660S https://www.fairchildsemi.com/datasheets/FD/FDMS3660S.pdf
Choke: 60A Blackwing
Controller: ISL6379 Hybrid Digital/Analog

X99 Extreme 11
Mosfets: 12x FDMS3660S https://www.fairchildsemi.com/datasheets/FD/FDMS3660S.pdf
Choke: 60A Blackwing
Controller: ISL6379 Hybrid Digital/Analog

Comes with 2x PLX 8747, so should have 72 lanes in total.

Asus
Most motherboards seem to center on 8x IR3550. They have paired them with 60A Blackwing chokes, which considering the current of the Mosfet works quite well.

They are using a custom Digi+ Controller? Suspect it could be an IR3580, but need to verify. They all seem to come with an ASUS DIGI+ ASP1257.

X99-A/B]
Mosfets: 8x ON Semiconductor NTMFD4C85N
Choke: ?
Controller: ASUS DIGI+ ASP1257

X99-Deluxe
Mosfets: 8x IR3550
Chokes: 60A Blackwing chokes
Controller: ASUS DIGI+ ASP1257

Shot of the VRMs:


http://www.kitguru.net/components/motherboard/luke-hill/asus-x99-deluxe-motherboard-review/3/
Quote:
Originally Posted by Kitguru
Asus uses eight power phases to feed the CPU and a further four to provide for the eight DIMM slots. The CPU power system is controlled by a Digi+ 'EPU' ASP1257 digital controller, while a Digi+ ASP1250 chip manages the DRAM power. International Rectifiers PowIRstage IR3553M MOSFETs drive up to 40A of current through each power phase with a peak efficiency (quoted by International Rectifiers) of 93.2%.
This seems to be a typo, as the board clearly has IR3550M.

Rampage V Extreme
Mosfets: 8x IR3555
Controller: Digi+ EPU?
Not too sure about these chokes.
VRMs & Choke


Controller?

X99 WS-E
Mosfets: 8x IR3550
Controller: ?
Chokes: 60A Blackwing Chokes

Unique to this board is the 2x PLX 8747, which should allow 72 lanes in total (only the Extreme 11 has this as well). They are also using 12K caps, while most boards get 10k.
VRM Shots (Credit to Canis-X):

X99-Pro
Mosfets: OnSemi 4C85N (http://www.onsemi.com/pub/Collateral/NTMFD4C85N-D.PDF)
Chokes: ?
Controller ? Likely same Asus Digi+ version

http://www.ocdrift.com/review-asus-x99-pro/

Sabertooth
The power configuration is the same as their lower end counterparts.

Mosfets: 8x ON Semiconductor NTMFD4C85N and underneath is 8x IR3535M floating N-channel MOSFET drivers.
Choke: ? R15A 1501 is the marking and Asus advertises them as "TUF Chokes", although that does not help us
Controller: ASUS DIGI+ ASP1257

From KitGuru:
Top side


8x IR3535M on bottom


RAM Mosfet:


EVGA
X99 Classified
Mosfets: 10x IR3550
Controller: IR3563B
Chokes?

RAM is being driven by 4x IR3553M.
10x IR3550M Mosfets


Controller:

Gigabyte
Most motherboards seem to be 8x IR3556. They are paired with 60A chokes, so it's a solid fit.

Please see the following:
http://www.tweaktown.com/guides/6765/gigabyte-ga-x99-soc-force-motherboard-overview-and-overclocking-guide/index2.html

X99 SOC Force
Mosfets: 8x IR3556M (http://www.irf.com/product-info/datasheets/data/pb-ir3556.pdf)
Controller: IR3580 for CPU; IR3570A for RAM?
Chokes: 76A Cooper Bussmann R15-1007R3 (see the following: http://www1.cooperbussmann.com/pdf/79793630-1b1e-49f8-a6d0-ea9b2be9f2e4.pdf)

There are 4x IR3553M for the RAM.
Mosfets:



Controller:


RAM Mosfets

X99-UD7
Mosfets: 8x IR3556M
Controller: IR3580
Chokes?

MSI
X99S XPower
Mosfets: 12x FDMF5823DC (rated at 55A) (https://www.fairchildsemi.com/datasheets/FD/FDMF5823DC.pdf)
Chokes: 12x 45A "SFC" chokes
Controller: ISL6388, which I think is hybrid?

X99S MPower - looks identical to XPower?
Mosfets: 12x FDMF5823DC (rated at 55A) (https://www.fairchildsemi.com/datasheets/FD/FDMF5823DC.pdf)
Chokes: 12x 45A "SFC" chokes
Controller: ISL6388, which I think is hybrid?

Scroll to post 27:
http://hardforum.com/showthread.php?s=0a1125fdf8dde407acc7c861b7335bf7&t=1831337&page=2

MPower and XPower appear to have the same VRM design.

X99S SLI Krait - looks identical to XPower and MPower?

X99S SLI PLus
Mosfets: 8x OnSemi 4C08N , 4c05N (possibly 16?)
Controller: ISL6388

For RAM 2x IR3553M managed by an ASP1250
Top



Overview

I believe that the Gaming 9 and Gaming 7 also share this VRM design.

Other thoughts
Will update this thread later on.

Am surprised though at the use of hybrid controllers still.

I'd be shocked though to see anything like D-Paks on X99 motherboards, even for the lower end mid-$200 USD boards.
 

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⤷ αC
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My lazy recopy over from
http://www.overclock.net/t/1510026/x99-motherboard-roundup/70#post_22991091
http://www.ocaholic.ch/modules/smartsection/item.php?itemid=1434&page=3
Quote:
This is basically the first point where things are starting to become really interesting. A first glance at the power design reveals that ASUS once again swapped the chokes and with the Rampage V Extreme you get so called MicroFine chockes. Apart from that there are mosfets from International Rectifier, which include low- and high-side. ASUS did not touch the 10K black solid caps, which apparently appear to be of sufficient quality even for ASUS's highest-end motherboard. In the case of the PWM controller chip there ASUS is using their own design, which they call Digi+. Overall the maker is keen on pointing out that a high-end power design is not simply about adding more phases, what's more important is the quality of the parts used as well as being able to provide a fully integrated solution.
http://www.ocaholic.ch/modules/xcgal/thumbnails.php?album=3651&page=6 , http://www.ocaholic.ch/modules/smartsection/item.php?itemid=1423&page=3
Quote:
The ASUS X99 Deluxe comes with a digital 8+4 phase power design. The CPU gets eight phases and the memory gets a stable current supply from four individual phases. Furthermore ASUS equips this board with their so called "BlackWing Chokes". Apart from that these chokes can cope with up to 60A per phase. A closer look at the capacitors reveals there are 10K Black Metallic Caps, which have an average life span of 10'000 hours.
http://www.hardwaresecrets.com/article/ASUS-X99-DELUXE-Motherboard/1877/6
Quote:
The CPU voltage regulator circuit of the ASUS X99-DELUXE has eight phases for the CPU. The voltage regulator is controlled by an ASUS DIGI+ ASP1257 chip, using a digital design. Each phase is controlled by one IR3550M integrated circuit.
http://www.kitguru.net/components/motherboard/luke-hill/asus-x99-deluxe-motherboard-review/3/
Quote:
The CPU power system is controlled by a Digi+ 'EPU' ASP1257 digital controller, while a Digi+ ASP1250 chip manages the DRAM power. International Rectifiers PowIRstage IR3553M MOSFETs drive up to 40A of current through each power phase with a peak efficiency (quoted by International Rectifiers) of 93.2%.
http://www.ocaholic.ch/modules/xcgal/thumbnails.php?album=3652&page=5 , http://www.ocaholic.ch/modules/smartsection/item.php?itemid=1424&page=3
Quote:
The ASRock X99 WS comes with a digital 12+4 phase power design, whereas the CPU is backed up by twelve phases and the memory by four. Like we've already explained on the features page ASRock is making use of an extensive solution. There are for instance Dual-Stack MOSFETs, NexFET MOSFETs as well as 12K Platinum caps on this motherboard. The Dual-Stack MOSFETs are taking care of stable and efficient current delivery to the CPU and compared to standard MOSFETs the offer a significantly lower RDS(on) value of just 1.2 milliohm. The memory gets backed-up by NexFET MOSFETs, which also offer a very low ROD(on) value of 2.9 milliohm. Last but definitely not least there 12K Platinum Caps that are good for no less than 12'000 hours of on time.
http://www.kitguru.net/components/motherboard/luke-hill/asrock-x99-oc-formula-motherboard-review/3/
Quote:
A twelve phase power delivery system feeds the LGA2011-3 CPU. ASRock suggests that the system can deliver up to 1300W of power, translating into an impressive 108W per physical electronic phase.

Looking more specifically at the components, ASRock opts for a 6-phase Intersil ISL6379 PWM controller to provide the overall VRM management. Six Intersil ISL6611A phase-doublers each take a single PWM input lane from the ISL6379 and convert it to two PWM output lanes. This allows ASRock to control up to twelve power delivery phases for the CPU.

Finding information for the ISL6379 PWM chip is very difficult, although numerous sources suggest that it is a 'hybrid' analog/digital controller. If that is indeed the case, it's the analog section of the controller that is to thank for ASRock's rapid voltage switching frequency which leads to positive power consumption numbers under static loads (as we will outline later). However, some of the enhanced accuracy and future-looking voltage level projection may be missing compared to a purely digital component.

Twelve unmarked chokes, each of which ASRock rates for a 60A output, are joined by 24 Fairchild FDMS3660S dual N-channel MOSFETs. The front dozen MOSFETs are electronically linked in parallel with the rear dozen, allowing the twelve available PWM channels to provide overall control for every transistor. The X99 OC Formula features roughly $22 worth of MOSFETs just for the CPU (although the OEM probably pays less by bulk ordering).

I'm actually quite surprised to see ASRock opting for the Fairchild MOSEFTs when some of its previous OC Formula parts used Texas Instruments' NexFET solutions, which are widely believed to compete with International Rectifiers' IR355x PowIRStage alternatives for the MOSFET crown. The move would imply that ASRock has strong confidence in the Fairchild components, but performance numbers from extreme overclockers will provide the best comparison data.

ASRock also uses Nichicon 'Platinum' capacitors, rated for 12,000 operating hours at 105°C, for power delivery functions. Scale that running temperature down to a realistic operating value and it translates into a very long operational lifespan for each capacitor.

bare VRM 2 300x182 ASRock X99 OC Formula Motherboard Review VRM rear memory 2 300x182 ASRock X99 OC Formula Motherboard Review

Two more ISL6379 PWM controllers manage the X99 OC Formula's 4-phase memory power delivery system. ASRock uses 'Premium Memory Alloy Chokes' which are suggested to deliver their current with reduced temperatures.

The Conformal Coating makes it difficult to read what is written on the electronic components, although I did notice Sinopower SM4337 MOSFETs in the memory's vicinity. There is also a pair of Richtek RT9045 regulators which (presumably) work with DDR voltage applications.
http://www.hardwaresecrets.com/article/ASRock-Fatal1ty-X99M-Killer-Motherboard/1878/6
Quote:
The CPU voltage regulator circuit of the ASRock Fatal1ty X99M Killer has 12 phases for the CPU. The voltage regulator is controlled by an Intersil ISL6379 chip, using a digital design. Each phase uses one FDMS3660S ("22CF 07OD") integrated circuit, which contains both the "high-side" and the "low-side" MOSFETs.
http://www.ocaholic.ch/modules/xcgal/thumbnails.php?album=3654&page=4 , http://www.ocaholic.ch/modules/smartsection/item.php?itemid=1426&page=3
Quote:
EVGA equipped the X99 Classified with a 10+4 phase digital power design with an IR3563B Chip from International Rectifier taking care of the CPU VRM. Furthermore you will find 100 percent Japan made high quality capacitors so that's a pretty strong power design.
The memory gets one digital phases per channel (4 DIMMs), which are also driven by chips from International Rectifier. In this case there are IR3570B chips. This gives you 4 phases in total for the memory.
http://www.overclockers.com/evga-x99-classified-motherboard-review
Quote:
With the heatsinks out of the way, we can see the 10-phase power design EVGA used for the X99 Classified. Voltage regulation is handled by the International Rectifier 3563B controller. All the other voltage controllers and MOSFETs found on the motherboard are also International Rectifier products.
http://www.ocaholic.ch/modules/xcgal/thumbnails.php?album=3658&page=5 , http://www.ocaholic.ch/modules/smartsection/item.php?itemid=1444&page=3
Quote:
Gigabyte equipped the X99 SOC Force with a digital 8+4 phase power design. There is a total of eight phases to stably supply the CPU with power and there are chips from International Rectifier controling the signals. In the case of the DIMM slots there are four more phases which are also controlled by chips from International Rectifier.
http://www.ocaholic.ch/modules/xcgal/thumbnails.php?album=3660&page=4 , http://www.ocaholic.ch/modules/smartsection/item.php?itemid=1428&page=3
Quote:
Gigabyte equipped the X99-UD with a digital 6+4 phase power design. There is a total of six phases to stably supply the CPU with power and there are Chips from International Rectifier controling the signals. In the case of the DIMM slots there are four more phases which are also controlled by chips from International Rectifier.

Other known boards with unknown VRM:
* ASRock X99M Extreme4 , ASRock X99 Extreme3 (6 phase?), ASRock X99 Extreme4 (12 phase?), ASRock Fatal1ty X99M Killer , ASRock X99 Professional , X99 Extreme11
* Asus X99-E WS , ASRock X99 WS, ASUS X99-Pro
* EVGA x99 Micro , EVGA x99 FTW
* Gigabyte GA-X99-UD3 , Gigabyte GA-X99-GAMING 5 , Gigabyte GA-X99-UD5 WIFI , GIGABYTE X99-UD7 WiFi, Gigabyte GA-X99-GAMING G1WIFI
* MSI X99S Gaming 7 , MSI X99S XPOWER AC , MSI X99S GAMING 9 AC
 

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Discussion Starter #3
Thanks for that. +Rep

I've made a partial update to all of the VRMs. It's looking like this round, all the higher end boards are seeing a level of standardization we have not seen in the past, with most going to either IR3550 or Fairchild.
 

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⤷ αC
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The issue with ISL / analog "hybrid" controllers is (voltage) overshoot and or have v_droop (a voltage drop from load). When you don't have a digital feedback loop then it's very easy to overshoot the voltage if the load changes.

The reason the analog stuff is used is because analog controllers tend to be faster.

http://sinhardware.com/index.php/vrm-articles/113-digital-vs-analog-pwms/74-analog-vs-digital-pwms

The reason you see more 8+ phase designs for the X99 platform is A. cost , B. CPU TDP is higher so even non-overclocked builds will need more robust power delivery components.

If you look at the ISL6388 data sheet (the controller on the MSI board) , the PWM only has 6 phases but with "Phase doubler and coupled-inductor compatibility". So essentially the waveform is only 6 phases but you are using two mosfets turned on for each phase instead of one.

http://www.intersil.com/en/products/power-management/computing-power-vrm-imvp/multiphase-controllers/ISL6388.html

It's the same thing for the AsRock's PWM:
http://www.intersil.com/en/products/power-management/computing-power-vrm-imvp/multiphase-controllers/ISL6367.html

----

On topic:

Asrock X99X Killer http://www.hardwareluxx.de/index.php/artikel/hardware/mainboards/32468-asrock-x99x-killer-im-test.html?start=1
www.ocdrift.com/review-asus-x99-pro/

To ensure reliability and stability during overclocking, ASUS has decided to use eight high quality rectifiers labeled 4C85N to convert alternating current (AC) to direct current (DC) power.

*** http://www.onsemi.com/pub/Collateral/NTMFD4C85N-D.PDF

Asrock X99 OC Formula (Confirmation) http://www.ocaholic.ch/modules/xcgal/thumbnails.php?album=3709&page=5
ASUS X99 Deluxe (confirmation) http://www.techbang.com/posts/19882-asus-x99-deluxe-feature-the-flagship-in-depth-analysis
Gigabyte X99 SOC Force (confirmation) http://www.tweaktown.com/guides/6765/gigabyte-ga-x99-soc-force-motherboard-overview-and-overclocking-guide/index2.html
 

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some of the most recently hybrid analog/digital stuff should be good and able to compete since the VRM is still integrated.

The GBT X99 all use IR3556
Also IR3580 on the SOC Force

The ASROck OC Formula uses the fairchild 2 in 1s

Each board has four VRMs for the memory. There are two memory VRMs per each side of the board. One of the VRMs for each set of DIMMs controls the dram voltage, the 1.2v voltage. The other VRM controls the DDR VPP supply for each set of DIMMs, which is at 2.5v. So many manufacturers are using dual output PWMs for memory, one for each set of DIMM, so they can power 2 VRMs with a single PWM, like the IR3570 on the SOC Force.
 

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Quote:
Originally Posted by Sin0822 View Post

some of the most recently hybrid analog/digital stuff should be good and able to compete since the VRM is still integrated.

The GBT X99 all use IR3556
Also IR3580 on the SOC Force

The ASROck OC Formula uses the fairchild 2 in 1s

Each board has four VRMs for the memory. There are two memory VRMs per each side of the board. One of the VRMs for each set of DIMMs controls the dram voltage, the 1.2v voltage. The other VRM controls the DDR VPP supply for each set of DIMMs, which is at 2.5v. So many manufacturers are using dual output PWMs for memory, one for each set of DIMM, so they can power 2 VRMs with a single PWM, like the IR3570 on the SOC Force.
Thanks for making an appearance
thumb.gif

Gigabyte UD4 seems to be 6+4 according to some sites but I think UD5 is the same?.

Is it the "Dual stack mosfet" marketing gimmick or TI NexFET style implementations where high+low side are together (on the Asrock x99 OC Formula and microatx OC Formula)?
 

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its ASRock's way of saying two in one MOSFETs, so the high and low side are in one package. It is like a DrMOS or IR powerstage but without a driver.

The GBT are either 6 or 8 on the CPU VRM, and memory either 4 or 6 total
 

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http://www.tweaktown.com/guides/6811/asrock-x99-oc-formula-motherboard-overview-and-overclocking-guide/index2.html
The CPU VRM features a total of 12 phases. Each phase is made up of two dual MOSFETs, and each two phases are powered by a doubler/dual driver. Half the VRM's powerhouse is on the back of the motherboard, and it is cooled by a small heat sink. ASRock is using 0.22uH 60A inductors; these are high-end ferrite inductors. Since fitting 12 phases on an X99 motherboard is very difficult due to reduced VRM real-estate, the inductors have to be small and capable, and these are both.

The inductors are actually where ASRock gets the 1300W number. We can do some quick math (power = current x voltage) to confirm. Total current will be 60A x 12 phases, which is 720A. The voltage in this case is the CPU input voltage of 1.8v. So, power = 1.8v x 720A = 1300W. This is one of the highest output VRMs for X99. There are also eight 560uF Nichicon high grade polymer can-type capacitors rated at 12K hours at 105C. That makes a total of 4480uF. So far, 12K is the highest I have seen on a motherboard for can-type capacitors.

ASRock is using an ISL6379 PWM for the CPU power, and two other ISL6379s for each memory VRM. Although this PWM has been out for a year, there is no datasheet on this PWM. According to Intersil, their other ISL637X series chips are hybrid digital PWMs: ISL6374, ISL6375, and ISL6376 are four, five, and six phase PWMs, respectively. The fact that ASRock uses two more ISL6379s for each set of memory DIMMs indicates that the ISL6379 is a dual output PWM. It should feature at least 6+2 phases, but more likely, its 7+2 or 6+3 phases, since the nine at the end of "ISL6379" would indicate the sum of all PWM outputs. This is a solid PWM with a good lineup of features. There is even one feature to allow the PWM to pulse all phases at once if needed, and you can control that through the BIOS.

ASRock is using 24 Fairchild Semiconductor FDMS3668S dual N-Channel MOSFETs. They integrate both the high-side and low-side MOSFETs into one package. These seem to be a substitute for the Texas Instruments NexFETs I usually find on ASRock's boards; however, they seem to have a slightly higher current rating. The continuous package limited current output is 30A for the high-side, and since each phase has two, you would take that 30A and double it to get 60A as max current output per phase for the MOSFETs. ASRock is using six ISL6611A phase doublers/dual drivers to double six phases from the PWM to 12 for the VRM. Intersil has worked hard on making their systems power efficient, and these doublers/dual drivers support phase shedding, and other high-efficiency technologies.

http://www.hardwareluxx.ru/index.php/artikel/hardware/mainboards/32277-asrock-x99-oc-formula-test.html?start=1
ISL6611A
http://www.reviewstudio.net/2087-asus-rampage-v-extreme-review-overclocking-with-the-master/build-and-features

The 8-phase VRM is cooled by an aluminum radiator that is linked through a copper heatpipe with a second heatsink situated behind the on-board interfaces, and covered by a plastic shield. The cover ensures the heat is dissipated outside the case. It is the DirectCU thermal design that uses a copper heatpipe in direct contact with the VRM, for better heat dissipation.

The Extreme Engine Digi+ IV technology is here to keep the system stable. It uses the new PowIRstage IR3555 chip that integrates the driver, high-side and low-side MOSFETs, and RDS On technology. It also features MicroFine alloy chokes. Extreme Engine Digi+ IV PWM scales to 1MHz so the memory VRM can achieve 40% increase in stability.

http://www.hardocp.com/article/2014/11/13/asus_rampage_v_extreme_lga_2011v3_motherboard
http://www.kitguru.net/components/motherboard/luke-hill/asrock-x99-extreme11-motherboard-review/3/

In short, the system uses 60A chokes, twelve MOSFETs, and 12,000 hour-rated (although significantly longer at realistic usage temperatures) Nichicon 'Platinum' capacitors to provide power. Electronic management is conducted by Intersil's ISL6379 PWM controllers and six rear-mounted ISL6611A phase doublers from the same vendor.

All-in, the X99 Extreme11′s power delivery system is not as pumped-up as that used on the X99 OC Formula, but it still looks to be capable of handling heavy overclocks, nevertheless.

http://www.tweaktown.com/guides/6805/gigabyte-x99-gaming-g1-motherboard-overview-and-overclocking-guide/index2.html

The CPU VRM features a total of eight phases; each phase is powered by an integrated power stage, the well-known International Rectifier PowIRstages. There are eight high capacity server grade inductors made by Cooper Bussmann. The FP1007R3-R15-R are 0.15uH Flat-Pac series power inductors; these feature 76A saturation current at 25C. This is an extremely high current rating, and will help reduce overall heat around the VRM area. The GA-X99-Gaming G1 WIFI uses 9x Nippon Chemicon, custom-made, 10K, can-type polymer capacitors, each rated at 560uF for a total of 5040uF.
GIGABYTE is using the International Rectifier IR3580, an eight phase digital PWM. This is the latest one offered by International Rectifier. The difference between this PWM and the IR3563 is that this PWM features special low power operation modes, such as single and dual phase operation. This VRM is a straight eight, meaning there is no doubling.

GIGABYTE has used the IR3556 for the power stages, and each one can output 50A at about 10W, and 90% efficiency. The IR3556 is a brand new PowIRstage; it replaces the IR3551. These new IR power stages offer better timing control, and reduce switch node ringing when compared to the first generation IR power stages like the IR3550, IR3551, and IR3553. They also offer internal current sensing algorithms, and improved temperature sensing, which should, according to IR, greatly increase current sensing accuracy. Support for synchronous diode-emulation through an internal zero-cross detect circuit is a new feature that should help a lot with ultra-light load efficiency.
http://www.hardwaresecrets.com/printpage/Gigabyte-X99-UD3-Motherboard/1886
The CPU voltage regulator circuit of the Gigabyte X99-UD3 has six phases for the CPU. The voltage regulator is controlled by an IR3580 chip, using a digital design. Each phase uses one IR3556M integrated circuit, which contains both the"high-side" and the "low-side" MOSFETs.

The Gigabyte X99-UD3 uses 10K Black electrolytic capacitors and Cooper Bussmann chokes.

http://www.clubedohardware.com.br/printpage/Placa-mae-Gigabyte-X99-UD3/3040
http://www.clubedohardware.com.br/imageview.php?image=76763
http://www.profesionalreview.com/2014/11/13/review-gigabyte-x99-ud7-wifi/
8 phases for CPU,4 for memory
IR 3580 PWm , IR3556 rated 50A
Cooper Bussmann R15-1007R3 inductors/chokes
5040 uF Black Metallic Capacitors (10K)

VRM for RAM: PWM IR3570A , Mosfet IR3553

http://akiba-pc.watch.impress.co.jp/docs/mreview/rental/20141031_673973.html
http://en.gecid.com/mboard/GIGABYTE_GA-X99-Gaming_5_motherboard_review_and_testing/

Processor power supply is performed via 6-phase scheme for computational cores and additional joints. Converter is based on a digital PWM controller IR3580.

IR3556M

Cooper Bussman choke
http://www.hardwarecanucks.com/forum/hardware-canucks-reviews/67582-evga-x99-classified-review-5.html

10-phase digital VRM design based on 60 amp Dr.MOS IOR 3550M MOSFETs and a International Rectifier 3563B controller.

In the first two images, you get a little side view of the optional I/O cover, as well as a look at the three chokes and three 40-amp IOR 3553M MOSFETs that make up the three-phase DDR4 power design for the left bank of memory slots.
 

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Thanks for the info AlphaC - I will update as soon as I have the time. My apologies on not keeping this thread up to date.

@Everyone

I think that the MSI Gaming 7 and Gaming 9 share the same configuration as the SLI Plus.

The MSI MPower and XPower seem to share a configuration as well.

Among the others, Asrock seems to be using Fairchild with ISL 6379.

Asrock OC Formula:
http://www.kitguru.net/components/motherboard/luke-hill/asrock-x99-oc-formula-motherboard-review/all/1/

bare VRM rear 300x177 ASRock X99 OC Formula Motherboard Review

A twelve phase power delivery system feeds the LGA2011-3 CPU. ASRock suggests that the system can deliver up to 1300W of power, translating into an impressive 108W per physical electronic phase.

Looking more specifically at the components, ASRock opts for a 6-phase Intersil ISL6379 PWM controller to provide the overall VRM management. Six Intersil ISL6611A phase-doublers each take a single PWM input lane from the ISL6379 and convert it to two PWM output lanes. This allows ASRock to control up to twelve power delivery phases for the CPU.

Finding information for the ISL6379 PWM chip is very difficult, although numerous sources suggest that it is a 'hybrid' analog/digital controller. If that is indeed the case, it's the analog section of the controller that is to thank for ASRock's rapid voltage switching frequency which leads to positive power consumption numbers under static loads (as we will outline later). However, some of the enhanced accuracy and future-looking voltage level projection may be missing compared to a purely digital component.

Twelve unmarked chokes, each of which ASRock rates for a 60A output, are joined by 24 Fairchild FDMS3660S dual N-channel MOSFETs. The front dozen MOSFETs are electronically linked in parallel with the rear dozen, allowing the twelve available PWM channels to provide overall control for every transistor. The X99 OC Formula features roughly $22 worth of MOSFETs just for the CPU (although the OEM probably pays less by bulk ordering).

I'm actually quite surprised to see ASRock opting for the Fairchild MOSEFTs when some of its previous OC Formula parts used Texas Instruments' NexFET solutions, which are widely believed to compete with International Rectifiers' IR355x PowIRStage alternatives for the MOSFET crown. The move would imply that ASRock has strong confidence in the Fairchild components, but performance numbers from extreme overclockers will provide the best comparison data.

ASRock also uses Nichicon 'Platinum' capacitors, rated for 12,000 operating hours at 105°C, for power delivery functions. Scale that running temperature down to a realistic operating value and it translates into a very long operational lifespan for each capacitor.

Quick search of the Mostfet:
https://www.fairchildsemi.com/datasheets/FD/FDMS3660S.pdf

Looks comparable to the IR3550M. 60A Mosfet, paired with 60A chokes. 12 phases.

Quote:
Originally Posted by Sin0822 View Post

some of the most recently hybrid analog/digital stuff should be good and able to compete since the VRM is still integrated.

The GBT X99 all use IR3556
Also IR3580 on the SOC Force

The ASROck OC Formula uses the fairchild 2 in 1s

Each board has four VRMs for the memory. There are two memory VRMs per each side of the board. One of the VRMs for each set of DIMMs controls the dram voltage, the 1.2v voltage. The other VRM controls the DDR VPP supply for each set of DIMMs, which is at 2.5v. So many manufacturers are using dual output PWMs for memory, one for each set of DIMM, so they can power 2 VRMs with a single PWM, like the IR3570 on the SOC Force.
Ok, I will update that. I think that the UD7, Gaming G1, and SOC Force are all using the same configuration, with the 8x IR3556.

I've also linked your Tweaktown article.

To be honest, I'm surprised at one thing. There isn't the level of overkill you get with like say, the Z77X-UP7 or the Z87 Xpower (32x IR3550).

I guess the second set of DIMMs makes it hard to make room.

Perhaps a 24 phase would be possible with 12 above the CPU and 12 below. The board would have to be XL ATX though (9 PCI slots) to accommodate the bottom set. That and you'd need perhaps 12 PCB layers to allow for the extra heat and power (to route each of the phases).
 

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Hello

Great to find this thread.
thumb.gif


It is not easy to look at every test site to collect infos.

I am interested what VRM structure the Asus X99-S got.

Asus X99 Deluxe MOSFETs : International Rectifier IR3550

Asus X99-A/Pro MOSFETs : ON Semiconductor NTMFD4C85N

Asus X99-S : ???????

Excuse my english and please keep this thread up to date.

Thank you
thumb.gif
 

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Quote:
Originally Posted by cuby View Post

Hello

Great to find this thread.
thumb.gif


It is not easy to look at every test site to collect infos.

I am interested what VRM structure the Asus X99-S got.

Asus X99 Deluxe MOSFETs : International Rectifier IR3550

Asus X99-A/Pro MOSFETs : ON Semiconductor NTMFD4C85N

Asus X99-S : ???????

Excuse my english and please keep this thread up to date.

Thank you
thumb.gif
Same here
 
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