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Samsung 840 Evo SSD extremely slow, need help!

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May 29, 2014 12:33:00 AM

Hi Everyone!

So I have an 840 evo 120gb.
I noticed that my boot up time is not as fast as other peolpe with the same ssd.

It's fresh windows 7 install, with drivers. Everything is up to date (bios, frimwate etc.).
So I ran a Crystalmark and get this result.:

SSDOK screen:

(at driver section it's in hungarian means it's using the windows's ACHI driver because it was even slover with intel's)



More about : samsung 840 evo ssd extremely slow

a b Ô Samsung
May 29, 2014 1:21:10 AM

Aside from troubleshooting, you should install Samsung Magician if you haven't done so and:

1) Update the SSD firmware
2) Set profile to Max speed
3) Overprovision (not necessary but recommended)
4) run "Performance Optimization"
5) Run the BENCHMARK
6) do NOT. I repeat, do NOT use Rapid Mode at least until we figure out the problem.

Now you do appear to have a problem, I just prefer the Samsung Magician benchmark.

Troubleshooting:
After you've done the above->
a) Install the "MAIN CHIPSET" and any relevent SATA drivers direct from the Motherboard support site if you haven't done so.
b) Make sure you are using the BEST SATA controller which should be the INTEL one in your case likely (see motherboard manual)

Other:
*I'm confused what you mean by it being SLOWER using Intel's but now using Windows' driver. I'm not sure how you SWITCHED them.

I believe it's either a DRIVER issue, or something a BIOS update would fix.
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a b Ô Samsung
May 29, 2014 1:30:27 AM

UPDATE:
You appear to only have the Intel SATA controller. It's a good one and should give nearly identical performance to mine. The ONLY thing I can currently think of would be if you didn't install the MAIN CHIPSET driver called "Intel INF Installation" probably and you shouldn't be changing the driver used.

Benchmark comparison: http://www.samsung.com/global/business/semiconductor/mi...

I have the 1TB model which is faster (i.e. 410MB/second vs 520MB/second Max Writes). Keeping that in mind, here is my benchmark in Samsung Magician:

Sequential read: 551
Random read: 68413

Sequential write: 506
Random write: 66043

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May 29, 2014 2:37:57 AM

You can switch between drivers via device manager.

I did everything you said in samsung magician no improvement. Every chipset driver is properly installed both mobo bios and ssd frimware are up to date.

And yes it was slower with the intel achi driver. Not much by the way.
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June 1, 2014 4:54:51 PM

Same problem here. I have a pretty old computer without AHCI, without trim function, SATA II with no controller BUT anyway I didnt compare my two Samsung EVO 1TB performance with other systems performances, but with another SSD I have in my computer, a 60 GB Mushkin Callisto DeLuxe.
I have to mention I applyed your advices in that order you mentioned for the Samsung SSDs.

1. CrystalDiskMark 3.0.3 x64

For Samsung EVO 1 TB....................................For Mushkin Callisto DeLuxe 60GB
READ (MB/s)...WRITE (MB/s)..............................READ (MB/s)...WRITE (MB/s)

Seq.........140.0......115.1.........................................168.1..........61.51
512k.......133.5......114.8.........................................165.5..........50.44
4k............32.35.......51.11........................................19.49..........48.69
4kQD32...39.25...72.78.............................................21.95..........41.63

so, some results are higher for the Mushkin, but the HUGE difference was with the second test:

2. Samsung Magician Performance Benchmark
.....................................For Samsung EVO 1 TB.................For Mushkin Callisto DeLuxe 60GB
Sequential read (MB/s)....................142................................................244
Sequential write (MB/s)....................116...............................................221
Random Read (IOPS).......................9583............................................6762
Random Write (IOPS).....................17820...........................................25840

Why are my results so bad and why Mushkin was superior despite the Performance Optimization of Samsung?
Any help/advice/suggestion would be highly appreciated.
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June 2, 2014 12:51:53 PM

UPDATE:

I figured out, that my ssd become slow only if I connect my WD 1TB Green sata HDD to my mobo.
If I unplug it the ssd is lightning fast.
Any ideas?
I mean I understand if the hdd slows down the boot time, but why the write/read speed of the ssd are affected?
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