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SSD Running at a fraction of the advertized speed

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June 26, 2012 2:05:21 AM

Hello, I am looking for help with my new SSD. I recently purchased the Samsung 128Gb 830 series ssd and am not receiving the advertized speeds. If anyone knows how to fix this problem, please let me know (and thanks!). I have read up on these drives and have made all (or what I think/know) the necessary steps to get this drive running optimally. Here are the details on my problem...

My Rig:
AMD Phenom 6 core 2.8 ghz
Asus M4A8TD/USB3
Samsung 830 series SSD
Western Digital 500GB hdd (3.0 Gb/s, 32 MB cache)
6 GB OCZ 1600 MHZ 6-8-6 timing RAM (in the first three slots)
Antec BP550
Asus EAH ATI Radeon HD5750 Formula

Windows/computer changes already completed for SSD installation:
AHCI is enabled
TRIM is enabled
Samsung SSD magician installed and updated, and all optimizations completed
SSD firmware updated (not actually updated, none available)
bios set to 6.0 GB/s
6.0 GB/s cable installed (yes i know the cables make no difference :)  )

Crystal Disk Mark:
-----------------------------------------------------------------------
CrystalDiskMark 3.0.1 x64 (C) 2007-2010 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 : 456.830 MB/s
Sequential Write : 316.934 MB/s
Random Read 512KB : 252.145 MB/s
Random Write 512KB : 296.701 MB/s
Random Read 4KB (QD=1) : 22.550 MB/s [ 5505.3 IOPS]
Random Write 4KB (QD=1) : 100.170 MB/s [ 24455.5 IOPS]
Random Read 4KB (QD=32) : 223.471 MB/s [ 54558.4 IOPS]
Random Write 4KB (QD=32) : 113.635 MB/s [ 27742.8 IOPS]

Test : 1000 MB [C: 56.5% (67.3/119.1 GB)] (x5)
Date : 2012/06/25 21:46:35
OS : Windows 7 Home Premium Edition SP1 [6.1 Build 7601] (x64)

Just some background info...
I have had experience with several SSDs in the past, and understand that the sequential read/write speeds are not too important to the speed of the drive, and that the speeds I am getting are to be expected. My question is on the IOPS. Also, a friend of mine has a comparable SSD (Mushkin 60GB asynchronous) on 3.0 GB/s and it is running almost three times as fast as mine. I am overall confused as to why this is occurring.

Thanks in advance for any help you can give.

(if you need any more details, just ask)
a b G Storage
June 26, 2012 2:44:42 AM

The reason is Crystal Disk Mark uses incompresible data as the benchmark. You should use ATTO because it uses compressible data, tailored for real-world usage.

Post back and see what you get.
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a c 542 G Storage
June 26, 2012 2:52:13 AM

Advertised Random Read speeds for your drive are up to 75,000 IOPS.
Advertised Random Write speeds for your drive are up to 30,000 IOPS.

Your CrystalDiskMark results indicate that you are getting 72% of advertised Random Reads and 92% of advertised Random Writes.

At default settings CrystalDiskMark writes 20GB of incompressible test data per run.
If you ran multiple benchmarks (3 or more) in a row without allowing TRIM and/or idle Garbage Collection to recover drive performance that could be a reason why your Random Read speeds are low.

If you ran only one benchmark then I don’t know why your Random Read speeds are low. Your motherboard has 6 6Gb/s ports so try another port and see if that helps.

Here’s the link to the spec sheet of your drive: http://www.samsung.com/us/computer/memory-storage/MZ-7P...
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Related resources
June 26, 2012 10:30:16 PM

Thanks for the help so far. As one reviewer suggested, I downloaded atto and ran it. The results did not differ and in fact the 4k speed was only 6 kb higher. Also, as another person added, I tried running the ssd on all 6 sata ports with no luck. If anyone else has any suggestions, please add! Thanks.
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June 28, 2012 12:09:07 PM

Hi all,
I am becomming somewhat dissapointed in my ssd. It is now running the same speed as, or slower than the hdd it replaced. I also turned off/adjusted the page file with no luck. If anyone has any suggestions, please post.
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June 28, 2012 2:20:10 PM

Dereck47 said:

Advertised Random Read speeds for your drive are up to 75,000 IOPS.
Advertised Random Write speeds for your drive are up to 30,000 IOPS.


I too get similar results (to OP).

When using Samsung Magician, only occasionally (one out of ten) do I get random reads of 30K; typically it is 2/3 of that -- using Magician. And this would be right after weekly performance optimization. Tried everything. (NB Test with only 100MB.)
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a b G Storage
June 28, 2012 6:07:16 PM

Don't benchmark too many times, it will decrease the performance of the drive.
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June 29, 2012 1:49:24 PM

In for more answers, this is exactly what I am looking for.
Not to thread jack, but last night I moved my Crucial M4 128GB to my HTPC to try out my $90 Samsung 830. The Samsung is noticably slower in all aspects than the Crucial, like a platter drive.
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July 7, 2012 1:17:13 PM

I would like to add one thing. I also tried using a mushkin chronos ssd and I recieved the same speed from both that drive and my samsung 830. Any explanation?
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!