Would you download cpuz and post a screenshot of the cpu tab. I am guessing you have an E2160 now and if I am right you could overclock your current cpu and might not need to get a new one.
lol pentium 4 duel core, I totally missed that. we will walk you through overclocking. Theres tons of extra performace just waiting to be unleashed. Get this and do another screenshot. I wanna see what your VID is. http://www.alcpu.com/CoreTemp/CoreTemp.zip
VID isn't the be all end all...my Q6600 B3 had a 1.325 vid and clocked to 3.86ghz...my Q6600 g0 had a 1.275 vid which is not great at all for a g0 and did 4.05ghz, 3.84ghz stable with 1.5v, 3.6ghz with 1.425v