I have a Z77A-GD55 and I can't figure out how to get 4 7970s to work on it. I was able to get 3 working without any problems. Does anyone else have this board?
I am downloading windows 8 right now and will try that, but after reading through this thread, It seems like I shouldn't need to switch from 7 to 8 with only 4 cards.
I have this board (Z77A-GD
55) and am currently running (5) 7950s on it, no presence shorts, dummy plugs, or powered risers. I just run the cards at stock clocks (925/1250) and under-volt them to prevent the need for powered risers. My current setup is Win 7 Ultimate SP1, 12.6 drivers and cgminer 3.1.0.
I get about 565Kh/s with this config: -w 256 -I 19 -g 1 --thread-concurrency 16384
My plan now is to see if I can get 6 cards working on this board.