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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
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
Rampage V Extreme
Mosfets: 8x IR3555
Controller: Digi+ EPU?
Not too sure about these chokes.
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.
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
EVGA
X99 Classified
Mosfets: 10x IR3550
Controller: IR3563B
Chokes?
RAM is being driven by 4x IR3553M.
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.
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
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.
(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
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:
http://www.kitguru.net/components/motherboard/luke-hill/asus-x99-deluxe-motherboard-review/3/
Quote:
This seems to be a typo, as the board clearly has IR3550M.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%.
Rampage V Extreme
Mosfets: 8x IR3555
Controller: Digi+ EPU?
Not too sure about these chokes.
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.
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
EVGA
X99 Classified
Mosfets: 10x IR3550
Controller: IR3563B
Chokes?
RAM is being driven by 4x IR3553M.
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.
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
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.