Okays, now take a closer look at the first pic (Cpu test from pcgameshardware.de):
Note the C2D E8400 has a min frame rate of 18 fps . The phenom 965 has 35. And this is what i'm stressing on.
What the pic doesnt tell you ,or rather most bar charts DONT , is the fps wrt to a time frame. What messes up a good gameplay is lag spikes/stutterting.This obviously would depend on the game itself..while OP maynot face such dips in say a fps shooter, he will be severely penalised in a crowded village scene in a RPG/RTS
Intel has (for the most time of its showdown with AMD) had better IPC peformance. Nevertheless if you are considering just Ocing the OP's the E6600you must also take it into consideration various factors:
1. OP has a E6600(4m cache, 1066fsb) and the test shows results for an E8400(6mb, 1333fsb). Even if he bumps his fsb (which i assume as the multi is locked at 9 for both), there is nothing that can be done for the 2mb L3 cache difference, and as we know in the c2d architecture/architecture of bygone years, this one oft the most critical performance parameters. And that is why you`ll see a considerable difference in gaming peformance bwtween the various flavours of C2D's from 65nm of E4XXX series(2m, 800fsb) ,E6XXX(4mb,1066) to 45nm E8XXX
2. Also take into consideration that E8400 has the SSE4 instruction set which the E6600 does not have.
3. The test platform consisted of a performance chipset P45 for lga 775, comapred to the G965 for the OP. Though the ram specs are not printed but irrespective of that, its safe to say the overall memory bandwidth at 1066 and 1333 fsb will be better than the 965-Small but a contributing factor nonetheless.
Coming to a i3 vs a phenom 965, again the IPC of a sandy/ivy is vastly superior to a phenom. Regardless of how the game designers made the game, most linear calculation will still go to mr cpu and the paralles one will end with gpu.From a purely gaming POV, the i3 will rule the roost wrt to a phenom
Pls understand my emphasis all along has been on a building a balanced system and no where am i contesting 77 vs 7850. The 7700 contest with the 6850, while the 7850 bites on gtx570, so obviously if u pair a 7850 with a C2d it will give more MAX FPS comapred to a 77 paired to the same. But as i said not only will the cpu bottleneck both both at any resolution, it will lead to a very choppy performance via the penalty suffered in min fps drops . Had the OP a more recent CPU(even dual cores) or even a late C2Q 9XXX series (which are just a shade below the first gen i5's) it would have been a no brainer.
But i assume regardless of his choice of GPU, you would agree that his cpu needs to go if he wants optimal performance.
Cheers!