Alright Il try to explain this as simple as I can.
I have a HP DC5750S/A64-38/80hnw/1.0R/4k US (Or DC5750s)
It originally came with the AMD 3800+, and Im going to buy a AMD X2 (Probly 3800+)...
http://www.experts-exchange.com/Hardware/Components/Power_Supplies/Q_23320618.html