I dunno, the thermaltake power supply I put in my wifes computer was very cheaply built, and constantly runs hot (not OMG hot but enough to make you wonder) ... Its not even a year old and I keep expecting it to die any day
on the other hand I have been having really good luck with the ULTRA brand power supplies, I have a 650 watter in mine and a 450 watter in my dad's (and I have been using them in any computer I built within the last few years with none gone dead yet...

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Thank you for the feedback! This helps. I have usually scavenged parts instead of buying them. Maybe Thermaltake outsourced some work to their friends at Pisstake? The 550 Watt I bought for the Mrs. is of decent build, but it's the only one I have seen, maybe I lucked out. I will do some research on the ULTRAs. The reason I went with them initially is because we accidentally ordered a BTX board, and there were hardly any BTX cases then, so I got a deal and have been happy with those products. Much better to read up before buying anything!