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Samsung 840 EVO read speed drops on old-written data in the drive - Page 3

post #21 of 3279
Quote:
Originally Posted by latelesley View Post

subbed to this, as i've just ordered an EVO 256GB. Since it'll be a clean drive, is there any tests I can do?

No, it'll work super fast when you first get it. With time the performance will drop due to the crappy TLC NAND

that's why I kept all my vidoes / pics / docs / music on it since I rarely change that data and there are almost never any writes happening + overprovisioning and the drive is always ina healthy state

the problem is if you use it as your main drive and data is constantly changing, the performance will fluctuate. Nowhere near as bad as the OP not like an HDD or anything but back then when I had the OS on my EVO I wasn't pleased with it at all so I sold it and ought an 840 PRO 512 GB. the moment the 850 PRO came out I jumped on that I still have two 512GB 840 PROs laying around though with only 1 TB written to em so they're like brand new
post #22 of 3279
Subbed. I've been noticing relatively bad read and write speeds on an 840 EVO. Though boot up is fast, speeds are just too inconsistent for actual use. The rapid mode doesn't actually work for me, so that's a large portion of advertised speed gone as well.

Agreed these drives are cheap, but they seem to be underperforming drastically. (Or at least mine is.)
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post #23 of 3279
Quote:
Originally Posted by MaXimus666 View Post

No, it'll work super fast when you first get it. With time the performance will drop due to the crappy TLC NAND

that's why I kept all my vidoes / pics / docs / music on it since I rarely change that data and there are almost never any writes happening + overprovisioning and the drive is always ina healthy state

the problem is if you use it as your main drive and data is constantly changing, the performance will fluctuate. Nowhere near as bad as the OP not like an HDD or anything but back then when I had the OS on my EVO I wasn't pleased with it at all so I sold it and ought an 840 PRO 512 GB. the moment the 850 PRO came out I jumped on that I still have two 512GB 840 PROs laying around though with only 1 TB written to em so they're like brand new

frown.gif This was my first delve into SSDs too, and i'd seen many threads recommend the EVO before this. I wish i'd went for the PRO now. I might start with the EVO, then in a few months get a PRO, as i'm planning on having it as my main OS drive.
post #24 of 3279
Quote:
Originally Posted by latelesley View Post

frown.gif This was my first delve into SSDs too, and i'd seen many threads recommend the EVO before this. I wish i'd went for the PRO now. I might start with the EVO, then in a few months get a PRO, as i'm planning on having it as my main OS drive.

Yes that's why the newer EVO is much cheaper than even the older 840 PRO

It's ok, it's not a bad drive, just make sure you overprovision it by 20 to 30% and ensure ou are in AHCI mode and ensure TRIM is working
post #25 of 3279
Found 2 more reports about slow reading speed of older files.

This from a Mac user:
http://www.insanelymac.com/forum/topic/299355-samsung-840-evo-slow-read-times/
Quote:
Quote:
I have a hackintosh with 2 840 EVO SSD’s inside, and their read times gradually slow down A LOT.
'Freshly' written files on the SSDs do show normal read rates.
With files a few months old, AJA shows read times as low as 65MB/s...
Write tests are fine, I only notice a strong read degradation over time.
This is specific to those Samsung SSDs, I also have 2 smaller M4s installed with no such issue.

And this one on a German shopping meta site:
http://geizhals.at/de/?sr=977944,810630#7298136

Quote (translated):
Quote:
Have the 750GB and 250GB EVO. I bought them 6 and 9 months ago.
A few days ago I found that both EVO drives are extremely slow reading larger (> 100MB) files that are already longer (about half a year +) on the SSD. Speed is between 5 MB/s and 30 MB/s. A firmware update changed nothing. Magician says everything is good. After I copy the same files, reading speed is fast as normal.
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post #26 of 3279
Is there something that im missing? My 250gb 840 EVO seems slow as well

Here are my results:
The 4K read time was 26.63 MB/s
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post #27 of 3279
Thread Starter 
Quote:
Originally Posted by BrainSplatter View Post

Found 2 more reports about slow reading speed of older files.

Well we can say now that the problem is possibly on all EVO drives (TLC memory?) and EVO owners are starting to be aware of it.

Now the only thing to do should be to ask a samsung comment, but how? I'll try to fill in a support ticket, just to see what happens, but for sure they'll ask me to reformat the drive :-)

In my opinion it will be best if for example Overclock.net or another authoritative tech site will publish an article about this and ask samsung to comment these problems!

@mend0k: if it's writing speed that is dropping, check if TRIM is working well with trimcheck (http://files.thecybershadow.net/trimcheck/)
post #28 of 3279
I've got a samsung 830 series. One of the first when they came out with the drive series. Granted it's only a 64gb drive it's still snappy as all get out. All benchmarks point to a drive that's running just as fast as the day I got it
post #29 of 3279
Have you guys tried using the Magician performance optimizing feature?
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post #30 of 3279
I took a shot at benching the 840EVO 250gb in my system (main OS drive)
...Just look at this horrid speed o.O



Only 20% of its max capacity has been used and barely even getting to its advertised speed, only in bursts. I feel a bit scammed by Samsung, or at least led to believe high speeds by false advertising/ information from samsung.
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