Does the 2nd PCI-e slot on this motherboard only work with video cards? I have a video card in one of the x16 slots, working fine. If I use the remaining x16 slot for a RAID controller - AOC-SASLP-MV8 (x4) - the card does not seem to be recognized: there is not reference of it at POST, also none of the drives attached to it are picked up.