I would look on a few sites to see what is available - novatech is pretty good. If you do not have any software that can specifically handle dual or quad cores you should go for the fastest core speed you can afford. My first corfe 2 duo was a 3 GHz but I found it slower running a single prog than my previous single core 3.8GHz. If the processor in that is the total speed but each core is only a fraction of it the pc will be quite slow. I assume each core is 2.33GHZ my core 2 duo is a 3GHZ per core and would be quicker for single tasks.