I have the GA-Z68X-UD3H-B3 motherboard and it was working fine with my FirePro W600 card in the 16xx slot. After upgrading the CPU to an i7-2700k CPU, the card will now only recognize in the 8x slot. I have tried updating the BIOS, cleaning the slot, and trying a new video card. Still only works in the 8x slot.
Any ideas?
Also, the video card will not show up during post as well. Only when it is in the 8x slot will it post using that video card.