Samsung 840 EVO 120GB (OS Disk) HIGH Seq read + write but low random read/write

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tom549

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Nov 25, 2013
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Hello,

I'm curious to why on samsung magician, after i use the benchmark tool i get 969 sequential read and 2832 write .. both well above the "up to..." mark.

random read write however, i get 53k on the read (up to 94k) and 73k on the write (up to 35k)..

any idea why they fluctuate so much?

cheers

Tom
 
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Not necessarily. As far as I know there's still a limit on how much system memory R.A.P.I.D can use, I know that when I tried it, it was about 1GB.
I believe that's now increased to 4GB.

Would it go faster? Possibly, more cache space would of course mean faster response, but it depends on what it's caching and how.

As for upgrading. I suggest either another stick (or two, depending on current setup) of RAM to...
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photonboy

photonboy

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Jun 20, 2006
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You appear to have RAPID CACHE mode on which uses your System RAM as a buffer.

This makes the benchmark rather useless and doesn't indicate the SSD performance accurately; it also can vary compared to others depending on your System Memory speed and other factors.

You probably don't have any issues though so I wouldn't worry about it.
 
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Those top figures are mostly out of range for SSDs, both in their ability and the interface limitations.

R.A.P.I.D mode is Samsung's [strike]benchmark fiddler[/strike] caching service, it uses a set amount of system memory, depending on how much you have - To cache data to that temporarily. System memory is considerably faster than a storage drive, even an SSD, which is why you're seeing inflated results.

The random read/write results are different entirely. Random read, especially 4K, are what your system will be using the majority of the time - The more the merrier. Unless you're writing super large files on a near constant basis of course.

R.A.P.I.D mode is a bit hit and miss, it depends how much you can allocate to it. Bear in mind that it's basically doing what Windows does already, just on a much larger scale. System RAM is also volatile memory, which is why I have a reluctance to use that feature. It's very good at saving to the SSD when it's finished whatever it was it was doing, but a power cut or something and bam, there goes your data.
In some tests the function has proved to actually slow down the drive by ever so small amounts.

All in all, I wouldn't rely on benchmarks for your SSD, make some real-world tests with the mode both on and off and find what you think is snappier. It's really quite subjective.
 
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tom549

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Nov 25, 2013
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Wow, makes sense :D -

so theoretically if i increase my 8gb of ram it'd go even faster?

Could also do with advice on what to upgrade next.

Processor : AMD 8320 @ 4.4Ghz + h100i cooler
GFX: 780GTX 4gb
RAM: 8bg 1600mhz corsair vengeance
OS SSD: samsung 120gb evo 840
Storage HDD's : 1x 500gb and 1x 320gb

cheers

tom
 
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Not necessarily. As far as I know there's still a limit on how much system memory R.A.P.I.D can use, I know that when I tried it, it was about 1GB.
I believe that's now increased to 4GB.

Would it go faster? Possibly, more cache space would of course mean faster response, but it depends on what it's caching and how.

As for upgrading. I suggest either another stick (or two, depending on current setup) of RAM to bring it up to 16GB. You probably won't notice the difference just yet, but the headroom is always nice.

Or go for a 1TB Western Digital Black and move all the files currently on those two storage drives to it.
 
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Speed, reliability etc...
I'd rather have a decent fast drive with a nice spec sheet rather than two okay-ish drives.
Saves a mount space too.

It was just a suggestion though, the rest of the system is pretty boss so aside from that or the RAM I see no reason to upgrade.

 
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photonboy

photonboy

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Jun 20, 2006
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Update:
1) RAPID MODE:
I've notice no difference in real-world usage. Keep in mind that you often buffer a lot of your program or data files directly into the System RAM anyway.

For example, restart your computer and start a non-network application like Microsoft WORD. It might take a second or so to start, but then close and start again and it's much faster because some or all got started from your DDR3 System memory rather than going back to the SSD to load.

I've done a lot of testing of real-world usage and generally once you have any SSD at all the advantage over an HDD is obvious but a faster SSD is really hard to notice. Extend that to RAPID MODE and even if it was benefitting it's likely almost impossible to notice.

2) 8GB vs 16GB:
There's no benefit so I wouldn't spend the cash. If and when you can see a benefit then consider getting more. Unless you edit video (not just convert) or know you would benefit. We may see DX12 streaming from System to Video RAM at some point which wants more System RAM but when is uncertain, and having 4GB of VRAM may negate the need for that. This is all in the future, so again why spend the money unless you have a reason.

3) HDD:
A 2TB HDD is often not too much more than a 1TB HDD.

4) Backup Image:
I recommend getting Acronis True Image to create a backup IMAGE of the Windows partition so you can RESTORE it in case of drive failure or data corruption (virus or whatever).

You can get the free version from WD or Seagate depending on what drive you have attached to your system (Seagate calls it DiscWizard).
 
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