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So for once.. being cheap paid off, and going for the P8P67 instead of P8P67 Pro means my board will do PCI-E 3 with an IB cpu... but is it worth it? running 2500k / 7870 right now so the only part i'm missing to jump from PCIE 2 to 3 is the CPU.
One game hardly makes the point that pci-e 3.0 is worth it.
If the bandwidth on the cards interface was needed, AMD, Nvidia, Intel, Via and other most def would have updated to pci-e 3.0 or beyond years ago. I do not know the match behind it all, though I have read time and time again that gpus simply do not need this much bandwidth, after all, they are being fed and giving out small chunks of incomplete/complete data. Its the cpu to the rest of the system that needs the massive bandwidth for it to do its job.
I think for the most part it(at this time) is hype, nothing more, consumers simply are not tapping into what we are currently using let alone something that far exceeds it. The scaling simply put it not there to saturate it.
For example quad or beyond 9800Gx2 or dual GTX590 will and are fed happily via even pci-e 2.0 x4/x4 x8/x4 x8/x8 etc. My buddy in his case was using gtx590 quad sli with x8/4 then went to x8/x8 then x16/x8 finally x16/x16 and the only time he noticed a true gain was shifting from the x8 to x16 speeds which saw a gain of only an average of 8fps or so, he did say it felt alot smoother though it did not really show in the fps numbers.
I guess thats all I can really say. AMD makes gpu/cpu/motherboard as does intel in a roundabout kind of way, if there was a true pressing need, they would have adopted this years ago. From what I have heard, the whole pci-e 3.0 thing was more adopted for SSD pci-e performance then anything else AND it does relieve overhead that pci-e 2.0 has in its implementation, So, maybe that gain you are seeing with BF3 as the example is not that its running any faster, but rather it does not have the overhead penalization associated with it?