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Samsung 840 EVO Performance Degradation

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November 18, 2013 12:55:50 PM

Hello folks,
I have a concern regarding my recent SSD purchase. I bought the Samsung 840 EVO (250GB), after reading great reviews from this website, and many others. The performance, however, doesn't come anywhere close to the bench marked numbers on Tom's Hardware, or the claimed IOPS. It says the maximum IOPS is supposed to be 97000. I am, however, getting 22000 random 4K reads QD32, and around the same number for the random 4K writes QD32.

I do have my Samsung Drive Magician software set up, and I have the latest firmware. I think I have SATA II on my laptop, although I know having SATA II shouldn't really matter all that much in terms of IOPS.

I am very confused to why I can't get the claimed performace out of the drive, and the numers that the Tom's Hardware team was able to achieve. Does anybody know what's wrong with my SSD?

On a side note, this is my first SSD and I love it. Because I haven't had an SSD before though, I am worried that I possibly have gotten a faulty slow unit that needs replacement. Please Help! Thanks!
a b G Storage
November 18, 2013 12:59:04 PM

Did you turn on AHCI in your BIOS?
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November 18, 2013 1:01:33 PM

enemy1g said:
Did you turn on AHCI in your BIOS?


Yes. It is turned on, and I installed windows 7 fresh on the SSD with AHCI enabled.
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a b Ô Samsung
a c 888 G Storage
November 18, 2013 3:53:52 PM

Of course iops and throughput go hand in hand and sata2 would affect it vs sata3.
http://en.wikipedia.org/wiki/IOPS
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November 18, 2013 4:00:08 PM

popatim said:
Of course iops and throughput go hand in hand and sata2 would affect it vs sata3.
http://en.wikipedia.org/wiki/IOPS


SATA 3 would make Random IOPS faster...? I thought it would be more of a sequential IOPS improvement...
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a b Ô Samsung
a c 888 G Storage
November 18, 2013 6:35:21 PM

At QD=32, yes - you'd exceed the bandwidth of the sata2 interface.
your scores are rather low though, what laptop do you have? I suspect your sata controller is the bottleneck.
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November 18, 2013 6:56:53 PM

popatim said:
At QD=32, yes - you'd exceed the bandwidth of the sata2 interface.
your scores are rather low though, what laptop do you have? I suspect your sata controller is the bottleneck.


I have the ASUS K52JT. I believe that it only supports SATA 3Gb/s. At this SATA configuration though, what numbers am I supposed to be seeing? The drive claims way higher speeds...
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