I have personally used Samsung’s 850 SSD drives in a few workstations, and they appear to work great.
However, there are several recent posts of Windows 2012 R2 and 2012 R2 Essentials servers crashing. The common denominator? Samsung’s 850 EVO SSD drives.
One person wrote that a 2012 R2 Essentials server will produce 100% crashes. Any other 2012 R2 server will crash if the write cache is disabled, which happens when a server is promoted to a DC. Hopefully, it’s a firmware issue with those drives that Samsung can address. Also, the Samsung 840 SSD drives appear to work just fine, and does NOT cause similar crashes.
Here are some links for your further reading pleasure that identify the issues at hand: