RE: Dell XPS 13 2015 and Samsung 950 PRO m2 Upgrade
I dare say you're right! I made the erroneous assumption that because it was an M.2 drive, it would work in any M.2 slot, but with all new motherboards now coming with M.2 slots, the 950 PR0 is very clearly meant for a desktop PC.
I returned the 950 PRO and bought a Samsung SM951. I installed it and it's working great. This is clearly the upgrade I should have bought from the start!