a BIG difference.
I dont like to use my brothers computer because he has a single core, and i got used to the speed of my dual core. But then again, i have better quality parts than he does.
I think you might need a new pair of ram because nowadays, DDR2 is being used, and i think you have DDR. Then you might need to get a new PSU, because i dont think your current PSU is sufficient for the build we are suggesting and adding the 9600GSO