I got a budget of $90 and a Phenom II x2 555 CPU (Did not unlocked ) that I can return for $105 credit, I have installed in my pc 2GB Ram (XP 32Bit) and I might install Windows 7 Ultimate 64Bit or stay with XP32(if I don't purchase the extra ram). With the credit and budget I can either get a 3.2GhzQuad core alone and stay with xp or a 2.8GhzTri-core+2GB Ram Stick combo and upgrade to 7 64bit. What is the best choice for gaming? Important Note: Got an XFX Radeon HD 5770 installed on the rig but seems it needs a better processor or ram to make it to the fps shown in some reviews. Also my 550W psu is good with 30A in the 12V cpu rail, and it had the video card cable too so I think is not really the psu.