Quick update - At this point I think its an issue with running PCIe 3 and 4 drives at the same time.
Both drives work independently, but as soon as both are installed (in backplane, or directly with a PCIE to U2 converter) the board is stuck (initializing AHCI, A2). Installed the Beta Bios but didnt help.
Will need to see if SM support has any idea for that...
Any one know of a deal some large cheap PCIe4 U2 drives (ideally on vsan capacity drive compatibility list)
?
Edit - combining a P5800X with some older drives works fine on other boards (Asus Z11PA), so maybe a board limitation after all
Edit2 - also no issue on X10SRI and Intel x10 boards
Edit3 here are my perf values on PCIE3 - I think
@Weapon's might have been slightly skewed due to cache impact and only 1G test size. Or his box is faster than my 6134m
Note my mix is write heavy (90%) and this is CDM 7.
Top is 970 pro 512G I had in there, bottom is the P5800x (onboard Oculink controler)
For good measure - top is 900p, bottom is P4800x, same board/cpu