Nevermind, I think I found the perfect overclocking for my system.
I turned off "eist" "c1e" and "visualization"
Set the FSB to 350x8
Didn't touch the voltage settings but switched it to manual.
Changed the memory ratio so that I get FSB-Memory ratio of 1:1
System is running at 2.8 ghz
CPU temp is 37 in Vista and 51 when running GTA4 at highest settings and fps is awesome.
I don't know why I didn't overclock before