Samsung SM951 M.2 SSD RAID Review – Over 4GB/s and 300K IOPS A Consumer Option


So my Test Bench sits a foot to my right and many have asked about the heat created with such a powerful storage solution.  After all, there was once a time when we were testing a full size enterprise solution and having to provide additional cooling measures for 2/3 this performance.  What can I say; I feel absolutely no additional heat in testing or typical use of the Samsung SM951 RAID 0 setup.  Am I sensitive to heat?  I can feel the heat permeating from my 50″ plasma five feet to my right.  There is no significant heat increase noticed.

This combination is amazing.  It can only be accomplished with the ASRock X99 Extreme 11 as this board has two ‘Ultra M.2’ slots capable of PCIe 3.0 X4.  They are leaps and bounds ahead of every other motherboard manufacturer out there and their decision to push storage boundaries has paid leaps and bounds!

ASRock X99 Extreme11 Motherboard Overview 2

It is also only possible with two Samsung SM951 M.2 SSDs.  The Samsung SM951 is the fastest and smallest storage solution in the world right now but don’t hold your breath; Computex 2015 is only days away and there will be many announcements.

Samsung SM951 M.2 SSD Front

It is becoming evident that we are seeing storage move into the realm of the CPU and DRAM memory, although we are not there just yet.  Just how important this is needs to be examined through the need of the user.  Will a typical user experience any difference whatsoever between this and any other SSD? No, they will not.  Will there be enthusiasts who snag this just because?  Absolutely.  The key demographic for this solution lies in the media professional first and foremost, an occupation where time is money and the quicker a project is completed, the higher the efficiency and better the return…or time away who knows right?

One thing is for sure though and that is the need for such performance as we move to higher caliber media such as 4K and eventually 8K video.  4K video alone requires 1.4GB/s data transfer speeds to effectively manipulate and this doubles that, with a 1TB storage space.  As much as we’d like to credit Samsung for their newest SM951, both Samsung and ASRock deserve kudos for hitting a home run with this combination!

Check Out ASRock X99 Extreme11 Pricing at Amazonblank

Check Out Samsung SM951 M.2 SSD Pricing at Amazonblank

Editors Choice-SSD copy Opt


User Rating: 5 ( 1 votes)


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    Eduardo Solanas

    I would like an article comparing real life tests if it is worthy a PCIE SSD or a SSD for example.
    What should we check in the benchmarks, random reads if what we want is a faster SO ? I don´t plan to move big files, I just want to have a quicker SO and an instant load of the games/levels, etc

    Any advice ? I want to buy a SSD but I want to know if it is worthy to have a NVME SM951 plus a new motherboard to support NVME boot or a Samsung SSD 850 pro ?


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      Sorry been a very long day… ‘SO’ ??? From what you seem to speak for taskload, I am not sure there would be a difference in either SSD.

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        Eduardo Solanas

        Yeah I mean SO load time, opening apps, loading game maps etc this kind of things would that make a real difference a Samsung SM951 NVME PCIE vs a Samsung 850 pro ?
        I thought high IOPS means opening apps load the system faster, and PCIE ones almost double the SATA SSDs

        If does not make difference then 850 EVO or 850 Pro any advice ?


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        Even an expert wount be able to differentiate between such as it is strictly disk access for start-up and application loading. Game maps I may have Sean comment on as he is more of a gamer and it seems logical that you might see a bit of a quicker load time there. To this point, however, I havent seen that as a common test metric as there are so many influences that can affect the result from one machine to the next.

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        Every single time I look at a SSD review my eyes go straight to the 4K QD1 speeds. It is my understanding that the 4K read/write is where you will most notice performance (higher 4K read/write speeds = faster OS operations). I do not discount response time and I am aware that high sequential speeds greatly benefit professional workloads but I am never as impressed with these (insanely high) GB sequential speeds as I am with 4K speeds. When SSDs first gained popularity the 4K speeds for read were around 16MB/s but now the high performers get around 50MB/s. This is not too impressive of an increase in 4 years as has been the sequential speed increase. Why is it that 4K speeds have only crept up so slightly?

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        Lubomir Zvolensky

        It is matter of application, optimizations, latencies, user mode->kernel mode switches, operating system stacks, hardware controllers used in SSDs, their sheer number, number of channels available to NAND, firmware optimization etc, etc.

        My take : number of channels from SSD controller to NAND and internal SSD latencies take the biggest role. Check out how many channels you have available on latest Intel P/S series and what kind of 4K QD1 performance they achieve. With the same operating systems and the same other deficiencies as all other SSDs are tested… yes I know, there is a price. Bentley ain’t cheap either.

        I also second opinion of RickH above dealing with ATTO performance results for 1024k, 2048k, 4096k and 8192k block sizes posted on page 2 of this review : there is clearly 32bit integer used for variable storing that result, so it simply overflows after 4GB/s what exactly is 4194304 bytes per second. So actually the performance results are:

        1024k writes : 3165823 reads: 4194304+201326
        2048k writes : 3138424 reads: 4194304+223253
        4096k writes : 3165823 reads: 4194304+223253
        8192k writes : 3165823 reads: 4194304+212097

        well, that’s almost 4.4GB/s in “decimal” format. Just wow. Yes, not that important in real life, but still wow for a chewing-gum size. Guys, this is maxing out PCI-Express 3.0 4x bandwidth, did you realize ? It probably wouldn’t go much faster even when connected to 8x slot as performance doesn’t get significantly better after 256kB blocks, all in all this is phenomenal result. How many NAND chips are on that board ? Next to none. Imagine SSD with 16 such chips and sufficient channels to get to them.

        There is no PCI-Express or any other bus today that could transfer that much data 🙂 PCI-Express 3.0 8x maxes out at 6.4GB/s (8GB/s theoretical throughput as each lane is 1GB/s).

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        I think “SO” is spanish for OS . . .

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    Wow! really … really impressive speed!

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    The ATTO read results aren’t so strange… it apparently uses an unsigned 32-bit integer for the speeds, in KB. You went so fast you overflowed. You can probably adjust for that and get the correct high-end speeds by adding 4194304 (2^32/1024) to each. The ATTO author never expected it to ever see speeds like these!

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    Review states M2 PCIe 2.0, but I’m assuming that’s a typo and you meant 3.0 X4?

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    How did you configure the RAID 0 with NVMe PCIe/M.2 SSDs? Windows included software raid?

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    ” It can only be accomplished with the ASRock X99 Extreme 11″

    actually if you pop a 2nd SM-951 in the Extreme 6’s 2nd PCIe 3.0 slot (via e.g. the ~$30 Addonics M2 adapter) it’ll be at 4X, equivalent to the 2nd Ultra M.2 port on the 11.

    Nice thing too is that the CPU’s lanes will be all used up, 8 to the GPU and 8 to the SM-951s . . . I don’t understand why only ASRock jumped on the “Ultra” bandwagon, it should have been obvious last year this was the way to go . . .

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    Hey Les – always admire your work. Quick ? though – I was not ever able to run Samsung Magician with RAID’ed Samsung SSDs. It just does not recognize them – any version including 4.6. Were you able to do so or I’m misinterpreting some of the screenshots?

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    Is it possible to raid a pair of SM951 with one on the M.2 slot and the other one on a PCIe 3.0 adapter? My MB has only one M.2 Slot (MSI X99A SLI PLUS)

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      Yes, it should be possible. You may need to update your motherboard BIOS. Also, as far as I understand, the RAID on x99 is limited to a software RAID, so you won’t be able to BOOT from the array, BUT there might be some fancy setup going on here with this specific AsRock x99 Extreme11 motherboard with its integrated LSI storage controller that could make booting from it possible. I wasn’t able to find that info though.

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    I am building my first pc and am not too familiar with PCIe lanes. My motherboard is a MSI z170a gaming m7. If I raid two SM951 in the m.2 slots, will it use the 16 lanes from the standard PCIe slots?

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    Just wondering how was the CPU usage? RAID 0 is usually super low but these are some crazy transfer rates.

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