I received my E8500 yesterday and got it installed tonight after work. It's running great, a nice improvement over the Celeron 2.2 GHz. The only problem I had is the new cpu came with a push pin heatsink/fan and the dell is screw mounted. I just used the stock Dell heatsink and fan. I've ran several test and it is cooling fine. When I do my next uprade of a Video Card (and power supply) I'll add a case fan or two.