Good day! After so much of debating between Mac mini or bringing back my 2012 3.06 I've decided to resurrect my beloved tower. Now I bought a sapphire pulse based on apple suggestion for compatibility but need to return it since it's having issues intermittent signal. Is the Sapphire Nitro+ be a problem for accessibility of PCIE slot #2? I heard it's thicker than the pulse and I need to put a USB 3.1 gen card in the futire for the slot#2. Slot 3 & 4 is occupied already. Thanks for any input you guys could share with this inquiry.