I have a home built computer that I 'd like to upgrade. I can't play the new generation of games. It has an AMD thunderbird 1.33 ghz PCU, nvidia geforce2 MX400 64mb video card and 512 MB ram. My question specifically is this- can I leave the t-bird family of chip into another AMD athlon chip. The T-birds only hit 1.4 ghz. I'd like to go 2ghz. What PCU would you recommend for my situation. If I can upgrade the PCU I may consider video card upgrade. I could upgrade the RAM also, it is not DDR ram and is realy cheap. I haven't so far because I didn't think my current system suffered from lack of ram alone. Any advice?