Here's how I did it, once I reached my cards maximum OC, I bumped the PCie frequency 1 MHz at a time and looked for a difference. I was able to get my PCie frequency to 105MHz, then it would artifact. However, in SLI I was able to get it to 110 MHz. So that would lead me to believe that, on that particular board, I could add 5MHz per card. SO I would imagine that on a quad SLI board you could add 20MHz.
So I'm assuming that OCing the PCIe, is actually OCing the PCIe lane and thus allowing more throughput.
I used the Crysis benchmark as my testing tool. And after I increased the PCIe lane, I noticed 1.5 FPS increase overall.
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