3820 vs 2500K for large resolution

[a4mula]

I'm planning a 3600x1920 Eyefinity rig and I'm having some concerns about 1155 and its lack of good Crossfire solutions. I know that x8 lanes aren't an issue at normal resolutions but at multi-monitor resolutions there have been benchmarked degredations using just a 480 in sli. This leads me to believe that a 3x 6950 will see even greater bottlenecking.

That brings us to LGA2011. It offers x16/x16/x8 which seems negate the bottleneck. The price difference between the two systems would be fairly negligible assuming the 3820 ships at 289.99. The $70 dollar difference vs the 2500K is offset by a cheaper X79 motherboard vs the nf200 Z68 offerings.

While I won't be seeing the locked 3820 hit 5Ghz like a 2500K could, I have yet to see any evidence that gpus are bottlenecked at 3.9 speeds either.

I also know the 7950 is right around the corner, but unless they've got the microstuttering issue resolved with just 2x cards, I think I'll be sticking with the 3x 6950 solution.

Thoughts?

 

[amuffin]

It all depends on your motherboard :3

 

[a4mula]

We can take the AsRock Z68 Extreme7 269.99. It represents the most affordable x16/x8/x8 solution available to 1155.

Compare that to AsRock X79 Extreme3 214.99 It represents the most affordable x16/x16/x8 solution to 2011.

$55 dollar difference isn't going to bridge the $70 gap between the two processors not to mention the additional $40 to go from 8GB (1155) to the 16GB that will be required for Z79. Still we're talking about a $55 dollar difference total between systems. I'll be buying an aftermarket HSF either way so that doesn't tabulate.

The primary question remains. Will non-bottlenecked 3x6950 perform better at 3.9 than bottlenecked 3x6950 at 4.5+?

 

[popatim]

It should since cpu speed isnt affecting bandwidth to the cards. 0.6ghz cpu speed difference wont be much of an impact.