New Box

[Husar]

Ah yep, that was it. Looked it up, seems the 840 Pro uses the MLC (2 bit per cell) flash but the 'other' 840 uses TLC (3 bit per cell). Presumably that 'other' designation applies to the 840 'EVO' parts TinCow specced as well. Incidentally, you also get a 5 year warranty with all the 840 (it's the same warranty for 840 Pro, EVO or plain '840' ) ...

Sure about the warranty?

A. Warranty Policy
SAMSUNG warrants to the original end user customer or purchaser of this Product ("You") that the Product is free from material defects and workmanship, subject to the conditions stated herein, for the shorter of: (i) a period of five (5) years for the 840 PRO Series and three (3) years for the 840 Series and 840 EVO Series

http://www.samsung.com/global/busine.../warranty.html

I don't think TLC chips are bad per se but the money you save is offset by a shorter lifetime even if the drive doesn't fail for other reasons.