Heres the specs. Its my old rig re-purposed. Been used for 5yrs+. MB picture included to visualize. The 5060 has to be in slot 4 for the space ideally to not block other slots. Wanted the a380 in slot 1. And the LSI can be slot 2 or 3. Intel says the 5930k has 40 pci lanes so it shouldn't be near maxed out. The MB can do 8x in all 4 slots per the manual (4way sli). No m.2 drives installed so its not using the x4 lanes. Its fine with the old a$$ k420, but when I pull it out and swap the ark card it starts having issues. Issues: LSI drops out, all 8 HDDs attached to it don't register, MB connected HDs are unaffected. Black screen on bios load up until unraid is fully loaded. Almost like a driver needs to load. Does it need compatibility mode on/off or turn off fast boot? Something to ensure its loaded before starting post? X99 Rampage V Extream 5930k (not OC'd) 64 gigs Dominator DDR4 (stock, no xmp) 1st pcie x16 - Nvidia K420 (gpu for bios, 5930k has no igpu) 3rd pcie x8 - LSI 9211-8i (flashed for HBA) 4th pcie x8 - 5060ti Thanks.