I have the msi b450 gaming pro https://www.msi.com/Motherboard/B450-GAMING-PRO-CARBON-AC the issue is i want to add a second card (just for kids/unraid etc) but i cant get any video card to work in the second pcie16x slot. i have 3 multiple tested cards, 710gt, 650ti and some older one. all work in a seperate pc, and also work in the main slot. normally you would think that its just the slot but i have a raid card that works perfect in there. ive tried updating the bios and doesnt fix it. is there something im missing?