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Samsung EVO 840 performance degradation: poor quality or factory defect?

Tags:
  • Samsung
  • Evo
  • Storage
  • Performance
  • SSD
  • Speed
Last response: in Storage
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June 4, 2014 8:11:58 AM

Hi all,
I bought a Samsung 840 EVO 250GB SSD some moths ago (in March).
I was suspecting a not-super speed but some days ago I got it tested with HD Tune and I was astonished... In the zone used by O.S. and softwares (first 40 Gb) the sequential read speed was around 40MB/s (see screenshot), slowest than my mechanical HDD...
Do you think it is normal for a randomly written data, that the read speed is SO slow for this model? Or it is a factory defect and I just have to get it replaced in RMA?
Before you ask: S.M.A.R.T. values are OK and Samsung Magician says all good and the firmware is the latest.
Thank you!

Screenshot:

More about : samsung evo 840 performance degradation poor quality factory defect

a b Ô Samsung
a c 253 G Storage
June 4, 2014 8:45:26 AM

That looks really strange but I'm not sure how relevant that graph is for an SSD. I'm not saying to disregard what it says, I just don't know.

Have you implemented all of the typical SSD Optimizations, like this: http://www.thessdreview.com/ssd-guides/optimization-gui...

Have you scanned your system with a good AV program and MalwareBytes lately?

Yogi
June 4, 2014 9:29:50 AM

Yes I think everything is optimized and working good also because as you see in the empty zone, the transfer rate is very high (500MB/s), and I repeated the test some times with the same results. If it was for a malware, the results would be random. The partition is aligned correctly (just cheked with as-ssd but I knew it was the default in windows 8.1).
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September 19, 2014 8:53:48 AM

Hello
I just want to say that I am experiencing the exact same thing as everyone else. Old data reads painfully slow. Rewriting the data fixes the problem. This is unacceptable because I am a composer and I constantly need to stream huge amounts of samples in real time. It has caused my work to be crippled. I hope Samsung fixes this problem, or at least acknowledges it because until then, for any other media/content creators out there who may be reading this, STAY AWAY FROM THE 840 EVO.
a b Ô Samsung
a c 253 G Storage
September 19, 2014 9:26:01 AM

I have found that Samsung's Tech Support is very good and they are easily available by phone. If you are located in the USA, call 1-800-SAMSUNG to be connected to their SSD Tech Support.

Yogi
a b Ô Samsung
a b G Storage
September 19, 2014 11:04:28 AM

I spoke with Samsung's SSD support. They told me they're informed about the "issue" and the engineers in Korea are looking into it to see if it is an "issue". Personally, i have the 840 since early 2013 and the EVO since September in two different systems and since benchmarks aren'ty foolproof, I tested the "issue" by opening up some games, example: Skyrim, and programs i haven't used since at least December on both systems and saw no degradation in load time or opening.
!