What kind of a game would run the same @ 2Ghz and 4.8Ghz Deneb chip?? There is no such a game and if there was it would be extremely GPU bound(I can't emphasize the word extremely).Both cache and core count are important(again look at Agena and Deneb and look at C2D Vs C2Q in modern games). There is a point where games stop scaling with CPU clocks since the GPU (yes even 5970) starts to bottleneck and can't process enough data.This happens with both Deneb and Nehalem.
Also first you need to find and show me "a bunch of games today" that can run the same @ 2Ghz and 4.8Ghz .There are no such games as I mentioned previously above.Second it wouldn't mean the games of 2014 would run the same on those 2 different CPU clocks since the games would a) be hardly playable with your current GPU if you would stick with it b) scaling would stop somewhere in between those two frequencies if you choose to buy a new GPU.The only way a game from 2014 could scale perfectly with clock speeds from 2 to 4.8Ghz is if it was coded with awesome multi core support and it uses all available CPU resources to the maximum(highly unlikely).
L3 sharing policies are very different in Deneb/Thuban and Nehalem so you can't just compare the bandwidth like that.AMD uses victim(spill over cache) while intel uses inclusive.I'm not to sure, we don't know how fast the L3 is. It could be enhanced much. I often see i7 with 3 times the bandwidth. Faster L3 could improve scaling.





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