Computer does not recognize second GPU
Really impressed with the support on these threads.
I haven't been able to find a topic on this issue yet but please redirect me if it's out there.
Any help would be greatly appreciated.
Here's what I'm trying to run:
GPU: 2 X (XFX Radeon 7990) http://www.tigerdirect.ca/applications/SearchTools/item-details.asp?EdpNo=8068167
CPU: AMD FX 4300, 3.8GHz
Motherboard: GIGABYTE GA-990FXA-UD5 (rev 3.0)
OS: Windows 7 64-bit
PS: 2 X (Corsair RM750) 750W for each card.
Okay so I have got my rig up and running with one card. I downloaded the latest catalyst drivers from AMD and installed them. I got cgminer up and running and had no problems.
Next I tried booting with the second 7990 but only the first card functions (the second card's fans dont even turn on). The second card is connected to its own power supply and everything else is connected to the second power supply.
After this I tried swapping out the cards and running that solo in the original PCI slot. However, when it boots, all the fans start pumping but there is no video output. I then put back the original card and it worked. Weird? Is this because I ran the update with the original card?
I also know that selecting graphics cards can be done through the BIOS but i ran into issues here. I bought the same model of this mother board two days ago but it was open box and had evidence that someone was using it for mining (it powered on automatically whenever power was connected). Whenever I booted and pressed the bios setup key the screen would always go blank like it was going somewhere but would never get there. Anyways, I exchanged this for a new one today. but I ran into the exact same problem with the bios. I even updated the bios using GIGABYTE's provided program with fingers crossed and still... nothing.
Is anybody else out there have trouble with GIGABYTE motherboard bios menu access? Can anyone please tell me how to get two cards up and running (i do not want to set up crossfire)?