SAMSUNG 840 EVO 500GB slow down

b0un7yhunter

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Mar 26, 2014
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Hi everyone,
Recently I notice that my SSD is slowing down. Before, the login screen would load before the animation even finish. Now, it will finish the animation and stay for a couple of second before loading the login screen.
I set SSD Magician OS optimization to Maximum reliability.
This is the Crystal Disk Mark result. I hope someone can help me with this problem.

Thanks.
-----------------------------------------------------------------------
CrystalDiskMark 3.0.3 x64 (C) 2007-2013 hiyohiyo
Crystal Dew World : http://crystalmark.info/
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* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 383.859 MB/s
Sequential Write : 264.859 MB/s
Random Read 512KB : 362.058 MB/s
Random Write 512KB : 246.112 MB/s
Random Read 4KB (QD=1) : 37.587 MB/s [ 9176.4 IOPS]
Random Write 4KB (QD=1) : 80.930 MB/s [ 19758.3 IOPS]
Random Read 4KB (QD=32) : 179.222 MB/s [ 43755.5 IOPS]
Random Write 4KB (QD=32) : 145.253 MB/s [ 35462.0 IOPS]

Test : 1000 MB [C: 59.4% (276.4/465.7 GB)] (x5)
Date : 2014/07/20 16:31:34
OS : Windows 7 Ultimate SP1 [6.1 Build 7601] (x64)
 

b0un7yhunter

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Mar 26, 2014
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@ Cemerian : Thanks for the suggestion. I did try and the speed is still similar to the result above.

@i7Baby : I have 188GB free out of 465GB.
 

i7Baby

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Spec -
Sequential Read: Max. 540MB/s
Sequential Write: Max 520MB/s
4KB Random Read (QD32): Max 98,000 IOPS
4KB Random Write (QD32): Max 90,000 IOPS

You're a long way from it.

http://www.samsung.com/global/business/semiconductor/minisite/SSD/global/html/about/whitepaper08.html

says "Samsung’s SSDs do not utilize compression, but many benchmarking tests rely on heavily compressible data. Therefore, in some mainstream tests, Samsung’s SSDs will appear to perform below a drive that uses compression."

and "The best picture of a Samsung SSD’s performance will come from a system- level, trace-based performance test like PCMark Vantage or PCMark 7 because these tests closely approximate actual consumer usage scenarios. If one must rely on benchmarking tests rather than hands-on testing, these tests are where to focus."

So try PCMark Vantage or PCMark 7 instead.
 

b0un7yhunter

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Mar 26, 2014
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This is the result from Samsung's own SSD Magician. The result is getting worse, and it's not even 1/2 year old. My old Samsung 470 never had this issue before. I'm downloading PCMark 7 as I write this. I'll post the result once it's done.

Thanks for your advice.



 

b0un7yhunter

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Pr3di, thanks for your advice.
I have use the guide to optimize my SSD since my old Samsung 470. Never had problem until now.



 

b0un7yhunter

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I have reduced the used space under 50%, but the performance got worse. Compare the result on my first post with my shared screenshot today.
 

b0un7yhunter

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I already set to AHCI since my previous SSD and it's still in that mode.
I connected my SSD to SATA3 port. I tried to move it around other SATA3 ports, still the same.
 

cemerian

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Jul 29, 2013
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how long have you had your ssd for, could be its time to RMA it, do you have a mechanical drive if so did you already try to only remove the hdd and leave the ssd alone, boot up windows like that, other than that you can try and check wondows power plan change that
 

b0un7yhunter

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Mar 26, 2014
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I really don't know what to look for here. The result from PCmark 7 is 6297, the rest are just the spec of my PC.





 

b0un7yhunter

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Mar 26, 2014
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I have Intel system with Gigabyte z77x-UD5H motherboard.



 

b0un7yhunter

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So after moving around the SATA cable I managed to get the improved speed. However, it is still below the spec. But Samsung Magician benchmark shows 160 Sequential Read?? o_O
-----------------------------------------------------------------------
CrystalDiskMark 3.0.3 x64 (C) 2007-2013 hiyohiyo
Crystal Dew World : http://crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 485.302 MB/s
Sequential Write : 491.981 MB/s
Random Read 512KB : 426.746 MB/s
Random Write 512KB : 416.584 MB/s
Random Read 4KB (QD=1) : 34.762 MB/s [ 8486.9 IOPS]
Random Write 4KB (QD=1) : 90.346 MB/s [ 22057.1 IOPS]
Random Read 4KB (QD=32) : 392.404 MB/s [ 95801.7 IOPS]
Random Write 4KB (QD=32) : 340.159 MB/s [ 83046.8 IOPS]

Test : 1000 MB [C: 46.1% (214.5/465.7 GB)] (x5)
Date : 2014/09/15 10:11:30
OS : Windows 7 Ultimate SP1 [6.1 Build 7601] (x64)
 

xkiller213

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Sep 15, 2014
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I suspect that it might be due to this: http://www.overclock.net/t/1507897/samsung-840-evo-read-speed-drops-on-old-written-data-in-the-drive

seems like the 840/ 840 Evo would have slow read speeds on old files... A defrag might help (yeah everyone says don't defrag an SSD, but it has more than enough life to defrag once every 6 months)...

the 840 (Evo)'s speed would be restored if the files were deleted and re-written again, that's why a defrag would help... (alternatively, you could clone the SSD, secure erase it, and then restore it)
 

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