Can anyone verify that all 7 pcie slots work? I've been working on this for several days. I've got jumpers and the changed pcie settings in uefi. I still get nothing but problems when I install more than 4 GPUs. I'm runing Ubuntu 13.10, and it won't even boot half the time.
System browser in UEFI does recognize that I have a 5th card installed.
If someone has gotten this to work, please let us know exactly what you did: Jumpers, UEFI settings, OS and drivers.
I haven't been able to mine much, but help us out and I'll certainly send some coins your way!
I have 7 x R9 290x GPU's On this Mobo
-Use Windows 8 or 8.1
-Use LBR's modded drivers in the litecointalk forum, which allows windows to have more than 5 Cards, or else you will have 5 working and 2 with CODE 43 in Device Manager
-Make sure The 1st PCI-e Slot you have a 16x - 16x Extendor
-In Bios Make sure Link Speed on PCIE - 16x Are set to Gen 2, Gen 2, gen 2 I was previously told Gen 2, Gen 1 , Gen 1, But I realised Gen 2 Also Works. (I dont know what the difference is )
-MAKE SURE - you
Short ALL the 1x Slots
-Make sure Your computer NEVER Sleeps, And Display Never switches Off In Windows Power Options
Thats what I did, And I used Powered risers on all slots, Not sure if that matters but I just did anyway
Interesting. While I don't have this setup I do have 5 - 7950's in a machine, Win8, 990FXA-UD5. Can you post a link to the modded drivers?