OT
I want to add a 5. card in my rig.
Is there something in windows I have to do or bios?
4works without problem 5 wont. 1000+850w PSU 4* 280x 1* asus 290
I tried running x5 R9 280x's on Windows 7 64bit system and I couldn't get the 5th card going. If you want to run 5 or 6 cards you need to go Ubuntu or Linux
I just started a second rig with the 5th card.
hope this helps