The difference may not be much so, to begin with, I'd suggest increasing the system RAM you have - especially if 1Gb or less.
Yes, a better CPU fan (than the stock one) will most likely be needed to keep temperatures reasonable.
There are some free ways to boost performance a little, so start by telling us your present RAM amount (including how many slots free) & hard disk size (including how much free space). I'm going to assume you use WinXP, but let us know if it's any other. G