Fast, but not better.

At the SSD I had high expectations, because the predecessor potters 840pro already in the computer. The 850 Pro is very fast - measured 550MB / s in lin Read on SATA 3 interface of a middle class IntelH97 boards.
Negative I rate Allerding the low perfomance increase compared to its predecessor. Since Prakisch nothing has been done. The ultimate in reality 4k Perfomance is still just as lousy as ever. The result is that a SSD from the "second row" is not noticeably slower - but for cheaper.

All other manufacturers cut in 4k performance as terrible from, but that's no excuse. Therefore I rate this on otherwise very viable product not with full marks.