However, HardOCP found that the read speed of the 120 GB model plummeted during testing, because of the poor longevity of TLC NAND. While the drive did not fail, the speed wasn't good. HardOCP said the 120 GB drive is not recommended due to the low endurance of TLC.
TLC NAND also uses more power due to higher voltage requirements.
TLC is still a solution in need of a problem because 19nm MLC is not expensive to produce and has superior characteristics. Furthermore, 128-bit MLC is now being produced which is even less expensive and which still outperforms TLC.
This is not true. HardOCP said the speed of the 120GB plummeted, but not "because of the poor longevity of TLC NAND". I can't seem to find it anywhere in their article, so I'm going to assume you or someone else made that part up.
In reality, the read speed of the 120GB drive (or any SSD, really) does plummet after it has been used for a while (usually referred to as the "steady state" condition). But, this is NOT because of the poor longevity of TLC NAND, or any other physical
degradation of the drive. It is a natural consequence of SSD's running out of free space, since they all need a significant amount of free space to perform optimally. How much free space exactly depends on a lot of things, mostly the controller used in the drive. Sandforce drives (ex: OCZ Vertex 1, 2, and 3 series), especially, do poorly in this regard.
The bottom line is: The 840 is a fine drive. It's not going to fall apart on you like some people seem to insinuate. If it does suffer from performance degradation, well, at least it is no different from any other SSD. And if you're coming from a traditional hard drive, it is like debating night vs. a cloudy day vs. a sunny day.
Last edited by whu113; 04-23-2013 at 02:57 PM..