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Samsung 840 Pro 256gb Performance

Last response: in Storage
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June 28, 2013 6:46:20 PM

Well, I decided to finally test my SSD and see if it was living up to its speeds for the marketing (it didn't feel like it was as crazy of an upgrade as people had told me it would be). It's in AHCI, did all the tweaks Tom's said to do minus turning off the flushing, and this is what I end up with in AS SSD. Also tried one with that flushing tweak turned off like they suggested and it made maybe a 1-2% difference which for the possible dangers is not worth it to me.



Those write speeds are atrocious. Samsung's magician software results are : 538 MB/s seq. read, 417 seq. write. 69110 random read (IOPS), 31959 random write (IOPS) The "up to" numbers for this drive are in the same order as before: 540 seq. read, 520 seq. write. 100000 random read, 90000 random write. The IOPS results are downright ridiculous--especially the write.

I've been scouring the internet for fixes and I haven't found anything that will work.

The only thing I haven't tried is updating firmware. I'm currently on version DXM03B0Q. While DXM04B0Q didn't do anything but fix low power environments (I'm on a desktop gaming machine so it doesn't apply), DXM05B0Q has killed so many people's SSD's that I'm scared to try. Not to mention that people on this 03B0Q firmware have posted WAAAAAY better test results than what I've got.

If anyone has any suggestions, I would greatly appreciate them!
a c 544 G Storage
a b Ô Samsung
June 28, 2013 6:54:31 PM

Connect your drive to another SATA port and retest.
Connect the drive to your motherboard's 1st SATA port (SATA0 or SATA1) if it is not there already.
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a b G Storage
June 28, 2013 6:58:37 PM

Read speeds look fine, more or less. Write speeds not so much.

Don't compare with official specs, they border on meaningless.
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Related resources
a c 96 G Storage
June 28, 2013 7:57:54 PM

Download and try Crystal Disk Mark and see if you get any better results.
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June 28, 2013 8:41:28 PM

Wish I knew how to take a screenshot of crystaldiskmart. I'll just give you the numbers...
Starting with read: Seq: 511 512k: 474 4k: 37 4k QD32: 283.
Now for Write: Seq: 471 512k: 160 4k: 89 4k QD32: 146
Now for the guy saying not to go on advertised numbers, I'm not trying to. Here is a comparison of a benchmark ran by tweaktown. Pay particular attention to the WRITE speeds.
http://www.tweaktown.com/reviews/5197/samsung-840-pro-2...
By the way, I changed over the SATA port (port 1 is loose where it connects to the SATA cable so it is currently in port 2), and took the SSD out of the hot swap bay thinking that maybe that was causing the issue. I ran this crystaldiskmark test with it all on its lonesome.
Anyone else got any ideas?
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June 28, 2013 8:43:43 PM

-----------------------------------------------------------------------
CrystalDiskMark 3.0.2 x64 (C) 2007-2013 hiyohiyo
Crystal Dew World : http://crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 511.085 MB/s
Sequential Write : 470.917 MB/s
Random Read 512KB : 474.406 MB/s
Random Write 512KB : 160.233 MB/s
Random Read 4KB (QD=1) : 36.785 MB/s [ 8980.7 IOPS]
Random Write 4KB (QD=1) : 89.115 MB/s [ 21756.6 IOPS]
Random Read 4KB (QD=32) : 282.976 MB/s [ 69085.9 IOPS]
Random Write 4KB (QD=32) : 146.159 MB/s [ 35683.4 IOPS]

Test : 1000 MB [C: 61.2% (145.4/237.5 GB)] (x5)
Date : 2013/06/28 21:43:06
OS : Windows 7 Home Premium Edition SP1 [6.1 Build 7601] (x64)
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a c 544 G Storage
a b Ô Samsung
June 29, 2013 2:25:51 AM

Your CrystalDiskMark results indicate that you are getting 94.6% of advertised Reads and 90.5% of advertised Writes.
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June 29, 2013 8:15:49 AM

Yes on the sequential I agree. I'm getting roughly 65# of random read, and ~35% of random write.
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June 29, 2013 3:11:25 PM

Alright, so I secure erased the SSD and also updated the firmware. Really getting somewhere here. My 4k QD32 is way lower than that of http://www.tweaktown.com/reviews/5197/samsung-840-pro-2... , but maybe its because I don't have as strong of processor (AMD FX8350 vs I7 3770k), and I'm running 1600 memory vs 1866. Still, the performance difference seems pretty huge, so I doubt that's all of the reasoning. Anyone else got anything to add?

-----------------------------------------------------------------------
CrystalDiskMark 3.0.2 x64 (C) 2007-2013 hiyohiyo
Crystal Dew World : http://crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 504.042 MB/s
Sequential Write : 485.452 MB/s
Random Read 512KB : 462.813 MB/s
Random Write 512KB : 471.798 MB/s
Random Read 4KB (QD=1) : 35.755 MB/s [ 8729.2 IOPS]
Random Write 4KB (QD=1) : 87.156 MB/s [ 21278.3 IOPS]
Random Read 4KB (QD=32) : 279.271 MB/s [ 68181.4 IOPS]
Random Write 4KB (QD=32) : 204.436 MB/s [ 49911.1 IOPS]

Test : 1000 MB [C: 61.1% (145.1/237.5 GB)] (x5)
Date : 2013/06/29 16:05:55
OS : Windows 7 Home Premium Edition SP1 [6.1 Build 7601] (x64)
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August 15, 2013 11:21:23 AM

really, your write speed is bad.
im having a Samsung 840 Pro 128gb on giga-byte 970a-ud3 , fx6300 cpu , first sata connector, amd chipset drivers installed, swap disabled, 8GB ram ddr1600 cl8, windows powermanagement set to performance, indexing service off. and the other sugestions for samsung magician.

firmware DXM05B0Q .
before you upgrade, trim your disk with magician software.

This is how it should look.

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