7x PCIe Mainboards that work with 7 video cards

[aliens]

I'm looking to build a 7 cards rig and I'm quite conflicted about what mainboard to get. There's scarce information about this as people usually try to limit their rigs to a maximum 6, so I've decided to make a short list of what I found on the interwebs during my research:

Working:

MSI Z77A-GD65 - link: https://bitcointalk.org/index.php?topic=186877.msg2206520#msg2206520
MSI Z77 MPOWER - link: https://bitcointalk.org/index.php?topic=285303.msg3049743#msg3049743
MSI Z87-G45 Gaming - link: https://bitcointalk.org/index.php?topic=449085.msg5469213#msg5469213
MSI Z87-G55 - link: https://bitcointalk.org/index.php?topic=449085.msg5700500#msg5700500
MSI Big Bang XPower (X58) - link: https://bitcointalk.org/index.php?topic=285303.msg3049743#msg3049743
ASRock Fatal1ty Z87 Killer - link: https://bitcointalk.org/index.php?topic=36061.msg4369450#msg4369450


Not Working:

MSI Z77A-G45 - link: https://bitcointalk.org/index.php?topic=97154.msg1069726#msg1069726


Unknown:

MSI Z77A-GD55 (probably not working, configuration similar to the Z77A-G45)
MSI Z87 Series (GD65, MPOWER) (probably working, configuration similar to the Z87-G45 Gaming / Z87-G55)
MSI Big Bang XPower II (X79)
ASRock X79 Extreme11
Gigabyte Z77X-UP7
Asus Z9PE-D8 WS


If you have any information on any of these boards or any other 7 PCIe boards, please let me know.

Hope this has been helpful for people looking for the same thing as I am.

[SneakyNinjA]

It might be more of a help to get the rest of the setup though. Many people are having issues geting 6x 290X working, where as 6x 7950 is easy. So its not so much a motherboard problem, as it is a software or BIOS ram problem.

[aliens]

Actually in the case of the MSI Z77A-G45 it's a hardware limitation, confirmed by MSI (check details in the link posted next to the board's name).

[daserpent1]

Well i dont think windows even supports more than 6 GPUs so buying a 7 pcie slot mobo would be a waste.

[Gazza1]

Who said anything about windows...

[aliens]

Will test the MSI Z87-G55 in the following days.

[Gazza1]

Will test the MSI Z87-G55 in the following days.

Please let me know how that goes.  I will be happy if it does 6

[aliens]

Currently doing 3 Sapphire R9 290 Tri-X on all 16x slots due to lack of risers with no problem. Hope to get some within a week.

[Lauda]

Good luck burning the board. Stop trying to save every penny on this.
5 to 6 card builds are best.
Thanks for the list though.

[InCoinsITrust]

Keep those cards cooled well. Without risers there is no room for fresh air, the cards will not last very long.

[Lauda]

Keep those cards cooled well. Without risers there is no room for fresh air, the cards will not last very long.

The board won't last long either.

[aliens]

Currently each card seems to pull a max of 25-30W per PCIe out of the board + 240-250W out of the 6/8 pin power connectors, measured at the wall. Temps are 75-85 while mining at about 810 kh/s (underclocked core clock to 900/1250).

[Burninj]

z87 g45 confirmed working with 7 R9 280x cards. z87 g55 and z87 mpower should work fine too.

Rig config :

- windows 8.1
- lbr modified 13.12 amd drivers
- All cards on 1x 16x usb risers.

[Amph]

z87 g45 confirmed working with 7 R9 280x cards. z87 g55 and z87 mpower should work fine too.

Rig config :

- windows 8.1
- lbr modified 3.12 amd drivers
- All cards on 1x 16x usb risers.

z87 g45 don't have 7 pci e

btw what is the best card with 6 pci e slot? i don't need the risers, i'm planning to do a different kinda of mining

[aliens]

z87 g45 confirmed working with 7 R9 280x cards. z87 g55 and z87 mpower should work fine too.

Rig config :

- windows 8.1
- lbr modified 3.12 amd drivers
- All cards on 1x 16x usb risers.

z87 g45 don't have 7 pci e

btw what is the best card with 6 pci e slot? i don't need the risers, i'm planning to do a different kinda of mining

Pretty sure it does have 7 PCI-E, both the MSI official page as well as the pictures of it confirm it:

https://fbcdn-sphotos-e-a.akamaihd.net/hphotos-ak-frc1/486760_4220021153748_1064197880_n.jpg

[milbest20]

z87 g45 confirmed working with 7 R9 280x cards. z87 g55 and z87 mpower should work fine too.

Rig config :

- windows 8.1
- lbr modified 13.12 amd drivers
- All cards on 1x 16x usb risers.

Burninj, on the z87 g45, did you have to short any of the pins in the PCI-e slots to get all 7 GPUs to work/be recognized?

[Burninj]

No shorting

[NameTaken]

https://bitcointalk.org/index.php?topic=296581.msg3182604#msg3182604

[Undland]

MSI Z87-G55  - not working with x1 risers in the x16 slots! Hot plug doesn't help me, but some peoples says it is

[Burninj]

MSI Z87-G55  - not working with x1 risers in the x16 slots! Hot plug doesn't help me, but some peoples says it is

try modify pcie gen in bios
and disable everything that is not needed in bios as well