Wow, rofl, epic thread.
Gaming : Heaven and Hell
Project overkill
Motherboard
MSI BIG BANG MARSHALL
CPU
2600k
GPUS
2X6990
2X590
RAM
32GB CORSAIR VENGEANCE 2000MHZ
PSU
Corsair AX1200
Cooling
Noctua NH D-14
LCD
720p DAIWOO LCD 60MHZ
Would b nice if 590s could work "together" with 6990s... Also you will need more than 1200W PSU.
They can on that board. It uses Lucid Hydra though I'd be very doubtful it'd scale that well even at 4 gpus, no to mention 8.