It's running fairly decently now with the help of a Rampage IV Extreme. The slot layout allows 3 cards to be installed with 1 slot of space between each for the fans to draw in cool air. The bottom card sits right on the bottom of my case which is fine since I cut a 2x120mm intake vent there. GPU temps are 72C-64C-59C top to bottom with the fans running at reasonable noise levels. I can see already though that's she's going to get noisy in the warmer months...lol!
Only 2 small issues to report: PPD is not what I hoped. Three 7970's in separate machines would net about 2.55 Million PPD and this looks like it will top out at around 2.2M. I have room to OC the GPU's but I'm thinking the CPU is the bottleneck here and there's not much OC room left without pushing the volts way up.
The other issue is I'm seeing lots of errors saying "No process is on the other end of the pipe. (0xe9) - exit code 233 (0xe9)" Approximately 10-20 per day. I've turned off the Windows Watchdog and I have plenty of RAM and swap space. Others have speculated that it's caused by running too many threads simultaneously. I'm running 24 but I also ran 24 with 2 GPU's and it didn't cause these errors back then. Initially I tried running 36 threads but all the WU's would error out so there's definitely an upper limit to how many threads you can run. I'd like to figure out what the bottleneck is that causes this limit though. I'll have to play around with it for a while I guess.
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