I am using the Asus P5B deluxe motherboard and currently I am using a 550watt power supply but I only have a 4 pin connector into the EATX12V power header.
For overclocking should i find a good power supply that will support a plugin for the EATX12V with a 8 pin header?
I had the same issue, you can get a 4 to 8 pin adapter, but I dont think its a big deal ran mine fine , I am saying that assuming you are running a core 2 duo which dont required anywhere near the juice of the older P4 .