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anyone know what thats for?

mine is set to 100, I heard it has something to do with OC stability and was wondering is it worth it to get it up to 107 and push my 460 to 900MHz core (artifacts at 880MHz now)
 

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You have to experiment with it.

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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