So maybe i should get another processor with a higher Ghz because i dont want to void my warranty. Do you think it is worthwhile to get a different cooler if you dont overclock?
It is very hard to damage your processor whilst overclocking unless you do something very stupid with the voltages. And even if you do, thermal throttling will slow it right down if it exceeds a certain temperature so your CPU will not be damaged. I can help you out with your overclock to as I know the P5K's BIOS very well and I can tell you what settings to select.
I think you will notice the difference with 4GB over 2 especially in Vista you are multi-tasking.
The E8400 is a great processor with fantastic overclocking potential. If you're willing to spend a little bit more, then it's a very good buy.
Here is an article about the Wolfdales: http://www.xbitlabs.com/articles/cpu...-wolfdale.html
BTW, what will you be using this PC for?