i have my e6400 chip overclocked to 2.66ghz, so would i see a significant increase in performance in games like Crysis and Unreal Tournament 3 if i were to upgrade to an e8400?
i'm also using 3 gigs ram, and 8800gt video card.
Maybe UT3, but not Crysis. Also, just like Epsilon said, you should be able to overclock E6400 to 3.2Ghz with voltage at 1.4V. If you manage to overclock E6400 to 3.2Ghz, you'll actually see more performance than E8400.
I would say it's worth it as long as your motherboard and ram are up to the higher fsb speeds. From what Ive seen most will hit 3.6 (400 fsb) with stock volts and heatsink. with a moderate bump in volts and good cooling 4.0 (450 fsb) is quite realistic. Going above that depends on how good of chip you get and how much voltage you are willing to give it.
I have a decent chip and can do 4.05 @ 1.26 vcore and 4.2 @ 1.32 (which is about as high as I feel comfortable with).
If you manage to overclock E6400 to 3.2Ghz, you'll actually see more performance than E8400
I really doubt that considering the 2m vs 6m cache and added memory bandwidth of the 8400 along with the other minor tweaks Intel made to the core. Also why would you compare an OCd chip to a stock one. If a person is going to clock one they will most likely clock the other also. Getting the 8400 to 3.6~3.8 is no harder than setting the fsb 400~422 (as long as MB and ram are up to it).