I have a Dell Dimension 8400 with a Pentium 4 Prescott DT 3.2GHZ CPU. I want to upgrade to a Dual Core (maybe Intel E6600)? Can I do this? I think I have a Socket 775. How do I know for sure before I buy? Also, I only have a 350W power supply. Is that enough for the E6600? I don't want to replace the power supply. I've never replaced a CPU and don't know much about this. I've already upgraded my RAM to 2GB and replaced my graphics card with a GeForce 7600GT. Would you upgrade the CPU on this machine? I really love the Dual Core CPU I just got with my new laptop. I want one for my desktop. I appreciate any thoughts!