Just found this thread. I've got two DL580 G7's with E7-4870's. I'm currently mining with 30 GPU's on standard mobo's. Never could get GPU's to work in these. Is it still profitable to set these up and eliminate the "small" rigs? I am currently running ZEC, but would switch out to something else if profitability is there. Would definitely want to swap CPU's to 8837's.
It all depends i would say. The DL580's are power-hoggers. What is nice is H/s per $ on the initial costs, but running them worth profit requires cheap electricity since there is a lot of overhead power drain on these systems. If your electricity is not cheap, i wouldn't mind moving my cards from the standard mobos. Perhaps you could take 1-2 PSU's from them switch to, since they are 90-95% platinum rated. Then you need breakout boards.