Do you guys know about the compatibility of X79 boards with PCIe 3.0 GPUs? I could never get my Gigabyte X79-UD3 to POST with a HD 7750 or HD 7870 but it works with a HD 5450, HD 5570, and HD 6970. I've tested the board with a E5-2650 ES and a E5-2680. The 2650 ES has some PCIe issues as I cannot use more than 16 lanes at a time whereas the 2680 work fine with additional PCIe 2.0 cards installed. I've checked a BIOS setting for UEFI opROMs but that hasn't helped.
8/24/16 at 1:58pm