Today, I found that the GTS 450 folder (not a cruncher) had turned off because the fan in the OCZ 600w PSU crapped out and was limping along when I turned the machine back on. Who knows how hot it got, but at least the thing turned off instead of catching on fire, and it runs fine with an externally powered 120mm 3pin fan.
The P55 FTW folder was on but locked up, and my 939 system was completely off, which was also strange. I wonder if the room got too hot and the rigs were baking in there, but we'll see if anything else happens in the next few days before I draw any conclusions. Florida is pretty warm again as usual, and I might consider stripping out and putting some older rigs in storage to cut down on the number of running systems and heat. I can easily consolidate some parts and have less machines going with minimal PPD loss, but I've just been running everything to see if I can get some 7 year old rigs to finally blow up.
And yeah, I bought the 7970 2 weeks ago. Sorry for the crappy wording as there's no way I'm parting with it already lol.