My old desktop PC which I built circa 2003, has officially stopped working. The parts in it are discontinued and I can't find them to buy anywhere. I am getting a new desktop as a christmas gift. I wanted you to tell me your professional opinion on which processor is better. I'm buying a desktop with an AMD Phenom X4 2.2 GHz with 8 GBs of RAM. I looked at another computer which had an Intel Core 2 Quad 2.3 GHz with 8 GBs RAM. Both had windows vista 64-bit OS installed on them. My old PC that I'm practically forced to throw away, besides a few parts on it like the graphics card, memory, drives, sound card, and PSU that I may be able to get about $150-200 for if I sell them all, was running a Pentium 4 HT 3.0 GHz, 1 GB of RAM, and an ATI Radeon X800 Pro 256 MB. If you compare a single core of the 2.2 GHz Phenom, and the 2.3 GHz Core 2, do their slightly lower clock speeds really give it less computing power than opposed to the Pentium 4 3.0 GHz? Or the Core 2's and Phenoms that par, or suprass 3.0 GHz? How much more computing power does having a quad-core CPU with higher clock speeds, such as 2.2 GHz as opposed to 3.3++ give you? Is a single core of the Phenom or Core 2 more powerful than a Pentium 4 with a 3.0 GHz clock? I've been told that clock speeds aren't everything when it comes to processors, especially multi-core designs. I've heard of today's latest quad-core processors overclocked to 4.0 GHz. And obviously it's going to be alot faster with 8 gigabytes of ram as opposed to only one. A little bit off-topic, but the computer I think I'm getting has a Radeon HD 3100 in it, which is underpowered from what I've been told. At least when it comes to running graphics intensive programs such as Crysis and any other DX10 game. Is the Radeon HD 3100 alot less powerful than the X800 Pro? Will I still be able to run DX9 games such as Battlefield 2 on it? If I were to upgrade to a better GPU, such as an Nvidia 8800-9800 GTS or GTX, would I have to buy a new power supply? I think the computer I'm getting only has a 400 watt in it. At full load, the high-end cards can consume 400++ watts.