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Samsung 840 Evo SSD Performance Degradation

eJoculate
By eJoculate
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Posted

I don't seem to have the problem as bad as some, might be because I re-install Windows every 6 months or so, still, I think I'll stick to MLC drive until this is fixed...

Might change my boot drive...

 

 

post-750-0-10132200-1410789532_thumb.png

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Posted

Just did a test on my 840 (not evo or pro) and my old file reads were like 40 MB/s after a defrag now its saying random reads are 500+ MB/s so maybe that's why my boot times are slowing down. I have 10.74 TB of writes to my SSD and it should be ok for over 500TB so my life spand seems to be fine.

don't defrag an ssd, run trim. 

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Posted

highly unlikely, different type of flash used. 

Doesn't even necessarily seem to be a TLC flash issue either. I have the regular samsung 840 which uses TLC flash like the evo, and my speeds are still very good. This is on an 8-9 month old windows install ~4tb has been written to the drive since I got it, ran filebench on my windows folder and sorted by lowest read speed:

 

 

DLhmyQi.png

 

Seems to me like some kind of firmware bug on the evo.

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@hojnikb as the expert (imo) care to weigh in?

 

My guess here is, that TLC, being inferior to MLC, loses "usable" charge in the cells faster (since there is less tolerances, because 8 states) so over time older files need more volate applied to cells to retreive data, hence slower reading.

 

It could also me some wierd f*ckup in the wearlevelling/GC mechanism, that makes older files somehow slow.

 

Both options are likely, since 840 (21nm TLC) is also getting the same slow read by some. And both of those drives have very similar controllers and same firmwara base.

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Posted

don't defrag an ssd, run trim.

Trim doesn't help the slow downs. Only defraging the ssd does because it rewrites the file making it fresh again like a clean windows install.

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First of all Samsung should address this asap. Users should not be running tools and utilities to fix drive's issues. Regardless of use scenario SSD should be as fast 6months and more down the road. Mine were 1month, not even, and I already had crawling speeds at the beginning of the drive. I am kot going to run various tools to speed it up, it should be doing this via own firmware.

Good thing I got mine via amazon. Intel, sorry I abandoned you :) I have Intel 330 few years old in one of PCs, will try to run tests on it to see if similar thing is affecting any drive.

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Posted

This is my wife's non-EVO Samsung 840 boot drive.  It's about 1-year old.

 

2j303sy.jpg

 

 

 

This is her drive after mydefrag monthly defrag

 

5nnf50.jpg

 

 

Along with the other non-EVO drives on the overclock forum, it seems to be effecting all Samsung TLC drives

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so I need your opinion: should I get it now, as the price dropped, and offers great speed, or should I get a different one, as this issue is not resolvable?

I will get it as a bootdrive

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How correctly defrag ssd disk? in mydefrag program there is many scripts (consolidate free space, defragment only, flash memory disks). I have Samsung 840 EVO 120 GB as system disk.

 

wsvgv9.jpg

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That's a shame, I just bought one of these (250gb EVO). I do hope that the one I got is better. :unsure:

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That's a shame, I just bought one of these (250gb EVO). I do hope that the one I got is better. :unsure:

 

Folks, always do your research when buying things like storage devices..

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BigBox: Asus P8Z77-V, 3570k, 8GB Ram, Intel 180GB & Sammy 750GB, HD4000, W7
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Posted

I did and I saw MANY reviews written on this drive and NO ONE has said this yet. Maybe I didn't look to clearly?

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I did and I saw MANY reviews written on this drive and NO ONE has said this yet. Maybe I didn't look to clearly?

this problem manifests itself over a much longer time than reviewers spend on testing the drives.

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I've been looking to get a new SSD to replace my old OCZ agility 3.

I was debating between the 840 evo (possibly waiting for an 850 evo) or an Intel 530.

This sure makes the choice a lot easier.

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Should I be worried about my 840 pro?

Ketchup is better than mustard.

GUI is better than Command Line Interface.

Dubs are better than subs

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How correctly defrag ssd disk? in mydefrag program there is many scripts (consolidate free space, defragment only, flash memory disks). I have Samsung 840 EVO 120 GB as system disk.

Use the Disk Defrag Monthly option.

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I've been looking to get a new SSD to replace my old OCZ agility 3.

I was debating between the 840 evo (possibly waiting for an 850 evo) or an Intel 530.

This sure makes the choice a lot easier.

Even if it cost more, I always go for Intel since they fully test each drive before shipping it to retailer. 

 

SSD is already fast enough in general so unless I am installing games on it, high-performance SSD is not needed for me

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Running 840 evo, had it for months hope it lasts until mid 2015 , then I buy win 9 and another ssd (intel maybe).

Connection: 200mbps / 12mbps 5Ghz wifi

My baby: CPU - i7-4790, MB - Z97-A, RAM - Corsair Veng. LP 16gb, GPU - MSI GTX 1060, PSU - CXM 600, Storage - Evo 840 120gb, MX100 256gb, WD Blue 1TB, Cooler - Hyper Evo 212, Case - Corsair Carbide 200R, Monitor - Benq  XL2430T 144Hz, Mouse - FinalMouse, Keyboard -K70 RGB, OS - Win 10, Audio - DT990 Pro, Phone - iPhone SE

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Won't moving the files from a folder to another fix the problem.

  ﷲ   Muslim Member  ﷲ

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Even if it cost more, I always go for Intel since they fully test each drive before shipping it to retailer. 

 

SSD is already fast enough in general so unless I am installing games on it, high-performance SSD is not needed for me

Here you go

  ﷲ   Muslim Member  ﷲ

KennyS and ScreaM are my role models in CSGO.

CPU: i3-4130 Motherboard: Gigabyte H81M-S2PH RAM: 8GB Kingston hyperx fury HDD: WD caviar black 1TB GPU: MSI 750TI twin frozr II Case: Aerocool Xpredator X3 PSU: Corsair RM650

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Posted
  • Author

Update:

Samsung has indeed acknowledged the issue and is prepping up a firmware fix, though without any mentioned ETA.

We will hopefully be able to resume basking in the SSD speeds of yore without scraping out a defrag every once in a while.

 

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Don't you like reposts? :D

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