DONT OC IT! get a fewbucks and buy e4400 or something! it will be hell better than your PD! PD 965 EE oced do 4ghz gives you performance of c2d clocked 2.1ghz! you need to check what cpus does your mb support and take the highest clocked at 800fsb, since your mb wont go much over 800 you need to have high multipler, and keep in mind 45nm are not supported by this chipset. I have mb supported by 945 and i chose e4700, it's G0 so it oc really well, i've got it to 3.46ghz since my mb cant go further, and btw this cpu is cooled by Pentium D stock cooler! trust me, there's no point in ocing that cpu. I used to have PD 920(2.8ghz 4mb cache).