If you're basing your thoughts on an old study I'm afraid you're a bit off as there is a bottleneck on higher end GPU's e.g. HD4870's and GTX260's and up. There are lots of games I've ran comparisons with when I was running my old Q9550 @ 3.99 ghz and three GTX280's in SLI vs. a core i7 @ 4 Ghz with 2 GTX280's like Crysis, Warhead, World in Conflict, UT3, COD4, and Far Cry 2, unfortunately stupid me never saved any of this data as a matter of fact I found a post I made on the EVGA forums back in November right after I had gotten my core i7 and OCd it to 4 Ghz with just two GTX280's in SLI otherwise I really wouldn't have anything to show you, but please look at the 40th post down on this link.
http://www.evga.com/forums/tm.asp?m=641863&mpage=2&key=Far,Cry?
The bottleneck with 3 GTX280's on FC2 with a Q9550 @ 4 Ghz was unbeliebably huge with just 2 GTX280's and the core i7 the runs were much smoother and FPS nearly doubled.
Check out my Far Cry 2 runs @ 3.99 Ghz Q9550 Vs. 4Ghz core i7 that alone is a huge difference in FPS, obviously the game is still very playable with the Q9550 @ 3.99Ghz, but there is definetely a big bottleneck in this game, even at 1920X1200 max settings, with the core 2 chips that is eliminated with the core i7 and the same goes for WIC the frames jump up once I ran the core i7 along with many other games like I mentioned above.
I wish I would have saved all those screenshots back then so I could show you, but I'm not the only one that's shown a bottleneck with GTX200 or HD4800 series cards and core 2 setups. I remember seeing a bottleneck still with a core 2 duo at 4ghz then jumping to 4.5gzh the frames went up about 8-12% accross many games with a single GTX280 and a single HD4870.
I know most games and apps out at the moment don't really take advantage of more then two and in a lot of cases even more then one core at the moment, but the technology from a core 2 chip vs. a core i7 chip is very different starting with the memory controller continuing on with the extra memory channel there is definetely improvements that show in games such as I've seen time and time again for myself not based on reviews I've found or word of mouth. The numbers are impressive to me and I'm very happy with the core i7 upgrade even though games being as playable as they are with a core 2 system from a "value" aspect of course it may not make sense to many.
Clock for clock the core i7 is a faster processor when compared with a core 2 quad and for high end single GPU's and especially more so for double, tripple, and quad GPU solutions the core i7 outshines the core 2 quad dramatically. Now I know FC2 is a heavily CPU bound game, but there is still great performance improvements especially on TRI and QUAD SLI setups when you use a core i7 CPU instead of a core 2 quad.
If the OP is deciding between X58 boards then my suggestion still stands go with the P6T Deluxe you won't regret how easy it overclocks and I'm sure you won't mind the extra FPS you will get from the GPU/s you decide to go with.