over clock some more if you are already using the external fans to cool down the rigs, (front to back in case ONLY leave the sides ON it helps air flow)
remove power supplies from the cases ( extra heat)
downclock / disable cores on processors , again less heat
^____________^ from here up its for getting rid of heat and increasing the longevity and the overclocking ceiling
possibly a linux based rig is more suitible, also check your SDK version i dont recall exact version but i think it was 2.1 thats GREAT for 5xxx series and the newere version is NOT
other than that check your PSU's and make sure they are all rated properly, newegg actually has a PSU calc that can help you out with some of the number crunching if youre not handy with it yourself
lucky you on the "free" energy but watch out if they meter you, you may just get a nice bump in rental!but i dont know about the fine print of your contract
hmm, those are some interesting suggestions.
I have noticed quite a bit of heat being given off by some of the processors, when i don't believe they do much at all when it comes to mining, although mining machines do tend to have ~30% cpu utilization? How low can they go?
yeah, i've considered putting linux on them, but currently i like the ease of use with logmein to fix miner issues while at work or elsewhere. They have a nice firefox addon or java based web viewer that i can use just about anywhere.
As for the SDK... yeah, i think i'm using the newest, like 2.4 ~ 2.6... Will i see a substantial increase in hash speed if i roll back to 2.1?
elec is the only thing i don't worry about, they don't even meter the individual apts.