Well what do you want a drive for? Just an overall system response increase or are you going to be putting the drive under a specific workload where over 1-2GB/s speeds would help? All of them have PCIe slots that can support 4 lanes. Now talking about specifically M.2 x4 slots, idk, i don't pay much attention to the mobo market.Plextor doesn't make the revo drive 350, OCZ does. Plextor makes a slower M6e. Up to you, what would you use them for?