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Guru3D.com » News » Samsung investigating 840 EVO slowdowns

Samsung investigating 840 EVO slowdowns

by Hilbert Hagedoorn on: 02/23/2015 03:11 PM | source: | 34 comment(s)
Samsung investigating 840 EVO slowdowns

A couple of weeks ago we already reported that the Samsung 840 EVO SSDs are still experiencing slow read speeds with old data. basically TechReport placed a couple of SSDs on shelf, didn't use them. Then after three months they connected them again and boom, slow performance of the old data written.

The issue was supposedly fixed with a firmware update (EXT0CB6Q-firmware) issued in October, but some patched drives continue to exhibit the problem, including one of our own. Late Friday afternoon, Samsung issued the following statement on the matter:

In October, Samsung released a tool to address a slowdown in 840 EVO Sequential Read speeds reported by a small number of users after not using their drive for an extended period of time. This tool effectively and immediately returned the drive’s performance to normal levels. We understand that some users are experiencing the slowdown again. While we continue to look into the issue, Samsung will release an updated version of the Samsung SSD Magician software in March that will include a performance restoration tool.

If you look at the screenshot above you can see the performance degraded. This test unit 840 EVO SSD spent more than three months of the shelf, he results are pretty shocking: the months old data on the disk was only recoverable with an average read speed of 35.1MB/s. 

After formatting the disk and loading it with new data the disk averaged 430MB/s in HD Tach, there's a abvious issue with long-term degradation of data stored in the triple-bit-per-cell memory.



Samsung investigating 840 EVO slowdowns




« Shuttle Launches Broadwell-based Fanless PC · Samsung investigating 840 EVO slowdowns · Nvidia 76% - AMD 24% - GPU marketshare Q4 2014 »

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HonoredShadow
Senior Member



Posts: 4299
Joined: 2007-05-27

#5018704 Posted on: 02/23/2015 08:20 PM
I hope not! I just bought an 850 evo 1tb! Decided to avoid the 840's.

k3vst3r
Senior Member



Posts: 3674
Joined: 2009-01-03

#5018707 Posted on: 02/23/2015 08:25 PM
I hope not! I just bought an 850 evo 1tb! Decided to avoid the 840's.


Well technically speaking was only meant to effect evo range, however am seeing slow down on my 840 pro in that ssd read speed tester bench.



-Tj-
Senior Member



Posts: 17800
Joined: 2012-05-18

#5018711 Posted on: 02/23/2015 08:28 PM
I've read about this, but never looked into it.

And wow that looks bad, thought its just slight degradation, but max 50mb/s is a disaster imho.

snip3r_3
Senior Member



Posts: 2981
Joined: 2004-12-17

#5018713 Posted on: 02/23/2015 08:31 PM
Well technically speaking was only meant to effect evo range, however am seeing slow down on my 840 pro in that ssd read speed tester bench.



I think only TLC drives have been affected. I haven't seen anyone with MLC drives report issues. Try manually Trimming your drive and leave a some additional free space if you can. Also try running it with older tools like HDTune or HDTach for sequential reads.

I've read about this, but never looked into it.

And wow that looks bad, thought its just slight degradation, but max 50mb/s is a disaster imho.

Yeah, before I ran Disk Fresh, my laptop was taking 10+ seconds to open Power Point... This shouldn't happen with a Haswell i7 and SSD.

Robbo9999
Senior Member



Posts: 1690
Joined: 2012-10-07

#5018722 Posted on: 02/23/2015 08:48 PM
oh ok thanks, i will try the test you recommend, did not realize.

same here i use the SSD for my OS drive only.

retested with the software you advised averaged 421MB/s

http://i496.photobucket.com/albums/rr323/stevevnicks/2015-02-23%2014.56.36%20Results%20for%20C.png" alt="" />

You might have some read speed degredation there, I get 530MB/s read speed on my system, it dropped down to the 300's when I had the degredation.

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