well as i said a high clock speed pentium 4 is an old processor but due to the high clock speed it will still run up there with some low end C2D's
and the diff between DDR and DDR2 is the speed at which the RAM runs at i belive pc3200 runs at 400Mhz now the standard is becoming DDR2 800Mhz RAM and infact there moving onto more expensive DDR3 at the moment running at 1600Mhz,
DDR2 is amazingly cheap at the moment aswell so now would be the time to upgrade before DDR3 becomes the new standard and you have to pay alot more out to update.
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