Sign in to follow this  
pa1983

Samsung 840 EVO and 840 user suffers serious preformance degradation over time

Recommended Posts

Yes people tested that. People that wants to know more should read trough the overclock.net thread. They are implementing such fuctions in those test programs to do just that. But rewriting data restores performance. So if you have some way of doing that it should work as a temporary fix. But expect the problem to return in a few months.

This is also the reason I think Samsung could make a fix like that part of ware leveling. Either move data after X amount of time or do a read the of LBA's sequentially at idle and rewrite any slow data. If the degradation happens after average 2 months that would mean it cost you 6 PE cycles per cell a year assuming the cells have data stored so a small fraction of the 1000 PE cycles per cell would be used every year.

Share this post


Link to post
Share on other sites
This is also the reason I think Samsung could make a fix like that part of ware leveling. Either move data after X amount of time or do a read the of LBA's sequentially at idle and rewrite any slow data. If the degradation happens after average 2 months that would mean it cost you 6 PE cycles per cell a year assuming the cells have data stored so a small fraction of the 1000 PE cycles per cell would be used every year.

Well, I could imagine that older cells have shorter and shorter performance retention, so that is something for Samsung to work out. I can also imagine they have a little more in depth knowledge and tools of what is possibly going on, so maybe other solutions are viable too. Fiddling with internal voltages, makes changes to the ECC mechanism, stuff like that. Another question is whether slow data is unreliable data, as that is, in reality, a much bigger issue.

The good thing is that this seems end user fixable (via a script or program shuffling the data around), so even in the unlikely case that Samsung denies any and all responsibility there is a way to live with the problem.

Share this post


Link to post
Share on other sites

Well only a fraction of users would know about the problem and fewer would user a fix. In the end I dont think its viable option. I will clam manufacturer fault here in Sweden either its covered by samsung or not here in Sweden any product with a proven manufacturing fault you can send back for a replacement. And if they cant fix it well then they have to refund you. And I already spoken with one of my resellers and with the amount off evidence it should not be a issue they told me. All they wanted are links to threads to confirm that more people are effected then by law they are obligated to help me. And if samsung wont release a fix I can skip the howl replacement product step the law allows the reseller to take if its a possibility. Theres no way a reseller can fix a broken SSD.

Share this post


Link to post
Share on other sites

Just signed up to say that I've noticed this problem, and defragging has cured it. This was my benchmark before:

nGB4cso.png

It's much much better now.

Share this post


Link to post
Share on other sites

Yea for now. Sadly wont last forever. interesting to see another 840 effected tough since the 840 EVO gets the most attention.

Share this post


Link to post
Share on other sites

Just checked a Samsung 830, I get a pretty straight line.

Overall write speed seems down compared to new, though that must be another issue. Let's see what I can do about that.

Edited by Camacha

Share this post


Link to post
Share on other sites
830 and 840PRO uses MLC NAND and are not effected as fare as we know.

Just being thorough :)

Edited by Camacha

Share this post


Link to post
Share on other sites

Well I ended up ordering replacement Crucial MX100 for all effected systems I built.

Anandtechs wrote in there comments to the new sandisk SLC drive that they have information they will reveal in a few days about the 840 /840 EVO bug so I would stay tunned to that web page the next few days and see what happens.

Share this post


Link to post
Share on other sites

I am really curious if they can fix it with an fw update. Let's hope for the best. The problem even after a new fw release it could take months until we know for sure it helped or not.

Share this post


Link to post
Share on other sites

No samsung realy wants to keep a lid on things as much as they can. Never samsung again for that reason. Customer support is just terible. It was good before I think. When I got a bad LCD monitor 5 years ago or something they sent a brand new one out ASAP after a phone call. But the new 3:e party support that dont have any contact with samsung just sucks so much. The retailers I spoken with confirms that the end user has no chance realy with there support nowdays. They are to big on retailer told me.

The fact that people like me and hundred of others have made us heard eventually triggered tech sites to write about it.

Nordichardware thanked me for the brining it up and helping them best I could collecting more data for there article.

But it sad that it took almost 2 months before samsung responded to the uproar from frustrated users.

Never Samsung Again!

Sweclockers responded to one of my e-mails but never none of the later once with anandtechs article etc.

But they wrote an article finally about it.

its like 200K swedish users in there forum so. Any news there gets attention.

http://www.sweclockers.com/nyhet/19362-samsung-840-och-840-evo-ssd-lider-av-prestandaproblem

Share this post


Link to post
Share on other sites
This thread is quite old. Please consider starting a new thread rather than reviving this one.

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this