Quote Originally Posted by WhiteFireDragon View Post
[*]generally, it's better to spread your GPU's between different computers than to try and fit as many as you can on one computer because they fight for resources (will provide link to my own system for reference)

Question about this; how much do multiple GPU's affect performance? And what resources do they share? If all the GPU's have enough free CPU threads and available memory then what causes the sharing conflicts?

I see SC's 3 x 285 machine averaging ~115,000ppd where it looks like a single 285 would do ~40,000. I also see some of the multiple 295 scaling much worse. The top host CNT-IQE's 4 295 Linux box only averages around ~210,000ppd; the next best comparable host I can see is the 2nd best linux 2 x 275 machine averaging ~70,000ppd. If those 295's performed that well that 4 x 295 box ought to do about 280,000ppd.

Anyone with any experience with multiple GPU's in multiple host vs single host loaded up with GPU's?