I recently changed mobo and hadn't bothered with M2 before Something I had missed when i selected my new one was it only had 4 SATA ports and I needed 5 Looking at my manual it says that as long as I get a pcie version and not a sata version of m2 then I keep all 4 sata ports, where as if I get a SSD version I lose SATA port 3, so thats clear a PCIe version for my boot drive should give me the other lanes I need back. What is confusing me is the mentions of x4 and x2 etc in some descriptions on the m2 2280 descriptions. Eg My mobo says 1 x M.2 connector (Socket 3, M key, type 2242/2260/2280 SATA and PCIe x2 SSD support) The key point is the PCIe x2 Would this just be a limit on the max throughput, so for example the a Samsung 960 EVO that says PCI Express 3.0 x4 would run fine in the slot? Some seem to mention this and others not. So is this just higher performance versions of the tech?