Well you don't have to believe it but it's true. BF3 MP64 is quite heavily CPU bound actually for some reason. If they aren't running i7's they'll be ever so slightly bottlenecked.
How else would you explain my jump in 10-15% in GPU usage on the same system? Gregster found the same thing when he moved to X79 although I believe his usage readings are a little more over the place.
An i5 is a nice chip, however if you want the utter max from your system and you play BF3 a lot then an i7 is better to get the max GPU usage. Some people are happy to take the 85% scaling with SLI as oppose to chugging more money on a CPU.
As I said, I am somewhat speaking from experience and I was perfectly happy with my set up with an i5 2500k @ 4.5 and SLI 680's. I then sold my CPU and motherboard and upgraded to Z77/Ivy for less than £100. The bump from i5 to i7 and PCI-E 2.0 and 3.0 was about 3-5% in BF3. Not worth it on its own but the reason was the releasing of the slight bottleneck and then minuscule bump from PCI-E 3.0.
I agree with Rusty on this. On my 2500K @ 4.6, my GPU's would only run at around 85% max but since going to X79 on a 3930K chip, GPU usage is now 99% on both GPU's. I thought it was just bad drivers (not scaling well in this game) on BF3 but was surprised to see that happening.
It still could be driver related but I now get 2 GPU's running at 99%
. BF3 MP64 is quite heavily CPU bound actually for some reason. If they aren't running i7's they'll be ever so slightly bottlenecked.
.