Cheers for that. It's definitely given me some ideas. Will probably get the Athlon, maybe a 6000+ as it's only 10 pounds more expensive than the 5200+ over here. About the speed thing though, Hz is the ammount of operations a processor does in one second so at a guess, if you have 4 2,4ghz processors, that adds up to a total of 9,600 billion (or whatever it is, I'm no good with numbers ) operations per second - even if each core is working independently? Edit: would have forgot. Will 4GB of memory work with a 32 bit system?