I was very surprised too when I changed my 64*2 @ 2.3GHz for an E8400 @ 3.5GHz I got +150fps (in css) with the same gpu ^^umm i had p4 3.0ghz and a 4870 and i got 40fps in source. then i got an e6550 and now i get 220-300fps. cpu matters a lot.
For my E8400 :
- 3.7GHz
- FSB : 412MHz (x9)
- 2*2Go OCZ reaper pc8500 5-5-5-15 1:1
- Vcore : 1.3v (bios)
- 56° in load (watercooled...)
- bad serie
I got it stable at 3.9GHz but I had to put up the voltage too much
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