Hi! I have an ASRock - EP2C602 very similar model to yours (They share a manual) I'm on bios version 1.8 (Saw there is a 1.9 from 6/19 i might need to upgrade to) but I do not see the PCI-E settings option to change from x16 to other layouts. Any advice on where to look or if 1.9 might be needed? Its possible that was a feature of your board but not mine from the same family maybe? Any suggestions appreciated.