Hi there. I have a Dell Optiplex GX620 that I got from my work. It has a P4 3.0Ghz cpu, 2GB RAM, ATI 1650XT gfxcard. My problem is that the processor is letting the system down for gaming and DVD encoding. Is it possible to swap it out for a dual core cpu. Online I have seen that it is LGA775 but will the mobo be compatible with dual core? Thanks in advance.