Hi,

I suspect that the m.2 SSD Sockets only support SATA speeds. Thought, I'd like to know if the sockets are 'B' Key OR 'M' Key? Cause if it's 'M' key, I could buy a nice SAMSUNG XP941. It won't run at full PCIe speed but if it can run near SATA's 6Gbps (750 MBps) that would be awesome (and better that any SATA m.2 out there).

Is there any alienware 15 or 17 R2 (2015) owners on this forum that could count the number of connectors on the smaller tab portion of the socket? If it's 6 connectors we have a 'B' key. If it's 5 connectors we have a 'M' key.

A really good explaination of m.2 can be found here :  http://goo.gl/yxUBqy (M.2 (NGFF) SSD Compatibility List)