So I bought this card second hand and it has been working flawlessly for quite some time now with the only problem being that it only wants to run from the secondary pcie slot (would love to throw morpheus II on this thing). I first had it on my x370 prime pro and i thought i just had a faulty mb but it does the exact same thing on b450 carbon ac. System locks happen at the same time on both motherboards during boot sequence (just before booting to windows when manufacturer's logo is still showing up). I've been trying to find a fix for quite some time now, thought maybe some of you might know what's up..
Cheers!