which one should i get im planing to play only games nothing else and overclock and do u think that can i go up to 4ghz with the pentium and c2d with dfi lp dk p45-t2rs turbo and 2gbx2 patriot 800mhz cl5 ram ?
If you are doing this for a new build, i would leave the Qxxxx alone and go straight for a i5.
If you are just replacing the processor i would personally get a q6600 - overclocks much better and has more cache memory. - though i dont know if you can get these anymore.
If you get any of the processors mentioned above and whack a decent HSF on top you should be able to get to 4Ghz - or damn close
i wouldnt bother with any dual core if you thinking of gaming. more games need a real world minimum of a 2.4 quad core. so look at a q8300 as a minimum. and at £100 its a great little chip.
if you do go with a dual core stay away from the e8200 its the worst dual in the entire range. it wont oc past 2.5 and thats from a stock of 2.3. the e8400 is ok but again pretty pointless if you wanna play games like bfbc2.
i would actually go the q6600 or similar, you can get them off ebay for a decent price and get them to 3.4ghz without too much effort. the higher multiplier allows better overclocking. q8xxx series overclock like poop. I would not go for this at all as a new build, that would be stupid. Let us know if its a new build, we can recommend you something much better. If just upgrading the cpu, go to ebay.