A:Answer Im not sure about other brands but the corsair mp600 the heatsink is actually removable, if not u can just take place them without the msi heat shield, that way u can show off your nice m.2 drives. And interms of pcie4 support i think it is all 3, the top one is directly connected to the cpu, the other go through the chipset, so if your only running one i highly recommend attaching it to the top slot. Hope this helped.
