Originally Posted by johnny13oi
Hi, I have a brand new Samsung 840 120GB and was wondering if I should sell it and buy a used "8 month" Samsung 830 128GB for $75? I am hoping to sell the 840 for $100 which would mean I save $25 going with the used 830. This drive will probably be mainly used in a laptop so power consumption is pretty important to me. The TLC chips in the 840 worry me a bit even though I have seen some review sites showing 3000 PE cycles. I tend to keep hardware until it dies so I plan on using this SSD for a very very long time and I am pretty sure a 120GB SSD with OS and programs taking up at least 60GB leaving less room on a 120GB drive will increase PE Cycles.
What would you do in my case?
The 840 was a gift and returning it is not an option.
If power consumption is important, than either of those Samsung SSDs may not be a good choice. Also, the difference between them in power consumption is virtually nothing:http://www.anandtech.com/show/7173/samsung-ssd-840-evo-review-120gb-250gb-500gb-750gb-1tb-models-tested/11
If you laptop will be idling most of the time, then the 840 is slightly superior. If you are writing a lot to the SSD, and you mentioned the "slow" 840 write speed, then those Samsung SSDs are apparently the most power hungry of many new, current SSDs.
The 840's faster 4K read speed than the 830 is a significant advantage IMO, outweighing any disadvantage with sequential write speeds.
Don't forget that the NAND chips are not the only component in a SSD. The SSD controller chip and its DRAM memory chip are always working when I/O activity occurs, while only a fraction of the NAND chips will need to be accessed. SSD failure has never been studied enough (or at least published publicly) to know what exactly fails when a SSD stops working. The NAND chips may be fine, but the controller, DRAM, or even a simple capacitor or two that fail, will result in a dead SSD.
Have any of the longevity tested SSDs at ExtremeSystems transitioned into the "worn out" NAND state? Where the data can only be read from the SSD, and no longer written to? IIRC, none of them have done that, they all just outright fail.
Originally Posted by hammong
"Really slow" writes on the 840 are still 128-160 MB/sec sequential. That's not bad considering 95% of your daily workload is read intensive. The read performance is comparable.
If you really want faster writes and faster random I/O, ditch the 830 AND the 840 and get a 840 Pro.
You will never (ever) see the real-world impact of TLC vs. MLC on a laptop application. And even if you did, by the time you hit 85% usable space, the drive's going to be so old and so small that Windows 2020 won't fit on it. LOL.
Good luck with your (good) advice, when SSD owners still believe in the "one speed all the time" write or read specification, or that a single access time number in AS SSD actually is valid all the time under any circumstance, your message will not be heard.
The real barrier to performance is the Windows file system code, and the realities of client-type data access needs. When some SSDs have performance of half the speed or less than that of the top models, yet users notice little to no difference between the two, what is left as the cause?
The fear of TLC NAND will subside once the 840 Evo is accepted by enthusiasts. Also the Turbo Write and partial SLC features of the EVO will sweeten the TLC pot. Very clever Samsung.