I got a 8800GTS sitting here. No PSU. I got a 550W but no power connector to use with it. So it sits and mocks me till i can get something to run it....
But for me till it at least cools down a bit i cant run the client. It is hot enough just leaving my PC on. With a window open 24/7 and a fan on full speed. Still is hot enough to roast a egg...