I have a Dell Dimension 9200. I know its old, but i know there's ways to make into a lower end gaming PC. I upgraded to windows 7, computer has 4gb of ram, a geforce 7900 gtx and a 1tb HDD. Beyond popular belief, i have read you can upgrade to 8 gb of ram and up to an intel core 2 Extreme Qx6800 Cpu. Can i actually do those upgrades? And if so, what are the top Gpu's i can buy for the new cpu and Ram. Also i have standard 375W power supply, I've read mixed reviews on if i should upgrade that as well. Thanks for any advice in advance!