Samsung 840 EVO read speed drops on old-written data in the drive - Page 67 - Overclock.net - An Overclocking Community

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Samsung 840 EVO read speed drops on old-written data in the drive

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post #661 of 3282 (permalink) Old 09-20-2014, 01:52 AM
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Read speed also seems to be badly influenced by pretty normal temperatures. The warmer the slower. Here are 2 shots, one with 32 degree celsius, one with 52. Read speed drops significantly:

It's also interesting that it seems that newer data seem to be less affected than older:

Newest: 510 -> 507 MB/s = - 0.8%
2 weeks old: 477 -> 427 MB/s = - 10.5%
3 weeks old: 278 -> 211 MB/s = - 24%
4 weeks old: 289 -> 177 MB/s = - 39%

Note: the very few old file which shows as around 500MB/s are actually files which were rewritten recently (the file date was explicitly set to the original date which is why they show up as old files).



FileBench006a.zip 164k .zip file
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post #662 of 3282 (permalink) Old 09-20-2014, 03:05 AM
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Originally Posted by inlandchris View Post

I bought my 840 EVO (4) in May from Amazon.com and now I am getting around writing a review; not a pretty sight. Maybe Amazon will contact Samsung and ask for an explaniation...or maybe not.

craig, a customer just told us your review was helpful to them while shopping on Amazon.



Samsung Electronics 840 EVO-Series...
Basically, I wrote a review on Amazon that said do not buy these drives until Samsung has found a firmware update, currently, last firmware update was March, 2014
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post #663 of 3282 (permalink) Old 09-20-2014, 06:12 AM
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Originally Posted by BrainSplatter View Post

The only drive we are sure there is a problem is the 840 EVO. For the 840 non EVO, there is a suspicion that it might deteriorate as well (maybe slower) but not much evidence yet.

I have an 840 non-EVO in my gaming rig, and using your File Bench 005a.exe I can confirm that it is definitely affected by this read-aging issue - see the screenshot below. I used 100MB as minimum size because for the smaller files there is more inconsistency in read speeds. I am not going to rewrite the files, so I can re-run the test with another params if necessary.

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post #664 of 3282 (permalink) Old 09-20-2014, 06:21 AM
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Thanks, that's definitely interesting, especially because it's a non EVO. Maybe u can run min 10MB or min 1MB just to get more samples.

If the 840 non EVO is affected as well, Samsung will have their hands full for the next weeks I guess.

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post #665 of 3282 (permalink) Old 09-20-2014, 06:35 AM
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Originally Posted by BrainSplatter View Post

Read speed also seems to be badly influenced by pretty normal temperatures. The warmer the slower. Here are 2 shots, one with 32 degree celsius, one with 52. Read speed drops significantly:
Man, kicking them while they're down... smile.gif

The stronger appearance of this temperature-related behavior on the older files suggests that it is another symptom of the aging issue, some sort of physical degradation, and not one of data organization.
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post #666 of 3282 (permalink) Old 09-20-2014, 07:05 AM
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Here are the results of the 1MB+ test (SSD 840 500GB non-EVO):




The chart is almost unreadable (at least for me) due to those big yellow circles everywhere.

The SSD's attributes (today, before the tests):
smart-info.txt 2k .txt file

The 10MB+ test is running right now. I just wish I could specify min-max size for the chart visualization instead of re-running the test over and over wink.gif
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post #667 of 3282 (permalink) Old 09-20-2014, 07:17 AM
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And here are the results for the 10MB+ test (SSD 840 500GB non-EVO):




I think that the 1-100MB files should be analyzed separately, because the impact of any variance in the system's utilization is much more significant for them than for the 100MB+ files where the impact is largely averaged out.
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post #668 of 3282 (permalink) Old 09-20-2014, 07:27 AM
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I re-ran the 100MB+ test, here are the results (SSD 840 500GB non-EVO):


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post #669 of 3282 (permalink) Old 09-20-2014, 07:46 AM
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The last test, 1000MB+ (SSD 840 500GB non-EVO):


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post #670 of 3282 (permalink) Old 09-20-2014, 08:35 AM
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Originally Posted by efahl View Post

Man, kicking them while they're down... smile.gif

The stronger appearance of this temperature-related behavior on the older files suggests that it is another symptom of the aging issue, some sort of physical degradation, and not one of data organization.

That's what I fear as well. And in that case, a complete fix just by firmware seems unlikely but I don't know enough about that stuff. Maybe somebody else can test their EVO with different temperatures.


@M500
Thanks, especially the 1MB bench shows that the problem seems to start right around 6 months ago. It would be great if you could do the same scan in about a week. Could be interesting.



FileBench006a.zip 164k .zip file

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