S2600CP4 board w/E5-26XX v2 Processors and PCIe Bus configuration.

Good evening,

Just wanted to verify before I purchase, that if I use E5-26xx v2 processors in a S2600CP4 that I can "adjust" a PCIe bus speed. I have a card that has a PCIe 3 bus, however the board has "throttled" that to PCIe 2.

Thanks much

Ray