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Samsung SM951 256GB PCIe Gen3 8Gb/s x4 M.2 80mm (AHCI Version) Solid State Drive SSD

4.0 out of 5 stars 192 ratings

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Digital Storage Capacity 256 GB
Hard Disk Interface Solid State
Connectivity Technology SATA
Brand SAMSUNG
Special Feature Portable
Hard Disk Form Factor 2.5 Inches
Hard Disk Description Solid State Drive
Compatible Devices Works with most motherboards and notebooks with a compatible M.2 PCIe interface slot. Includes Z97 and X99 motherboards and pre-cylindrical Mac Pro. Not compatible with the MacBook, MacBook Air or MacBook Pro See more
Installation Type Internal Hard Drive
Hard Disk Size 256 GB

About this item

  • PCIe Gen3 8Gb/s Interface, up to 4 Lanes
  • Compliant with PCI Express Base Specification Rev. 3.0
  • Support Standard AHCI driver
  • MTBF: 1.5 Million Hours
  • RoHS Compliant

Top Brand: Samsung

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Samsung SM951 256GB PCIe Gen3 8Gb/s x4 M.2 80mm (AHCI Version) Solid State Drive SSD
Samsung SM951 256GB PCIe Gen3 8Gb/s x4 M.2 80mm (AHCI Version) Solid State Drive SSD
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Product information

Technical Details

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Hard Drive ‎256 GB Solid State Drive
Brand ‎SAMSUNG
Series ‎SM951u00a0
Item model number ‎MZHPV256HDGL
Hardware Platform ‎PC, laptop
Item Weight ‎0.32 ounces
Product Dimensions ‎3.15 x 0.87 x 0.15 inches
Item Dimensions LxWxH ‎3.15 x 0.87 x 0.15 inches
Flash Memory Size ‎256 GB
Hard Drive Interface ‎Solid State
Manufacturer ‎Samsung
ASIN ‎B00VELD92U
Is Discontinued By Manufacturer ‎No
Date First Available ‎March 31, 2015

Additional Information

Customer Reviews
4.0 out of 5 stars 192 ratings

4.0 out of 5 stars

Warranty & Support

Amazon.com Return Policy:You may return any new computer purchased from Amazon.com that is "dead on arrival," arrives in damaged condition, or is still in unopened boxes, for a full refund within 30 days of purchase. Amazon.com reserves the right to test "dead on arrival" returns and impose a customer fee equal to 15 percent of the product sales price if the customer misrepresents the condition of the product. Any returned computer that is damaged through customer misuse, is missing parts, or is in unsellable condition due to customer tampering will result in the customer being charged a higher restocking fee based on the condition of the product. Amazon.com will not accept returns of any desktop or notebook computer more than 30 days after you receive the shipment. New, used, and refurbished products purchased from Marketplace vendors are subject to the returns policy of the individual vendor.

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Samsung SM951 256GB PCIe Gen3 8Gb/s x4 M.2 80mm (AHCI Version) Solid State Drive SSD


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Product Description

SM951 for use in ultra-slim notebook PCs and workstations. It comes in the M.2 form factor (80mm x 22mm), which is only about one seventh the size of a 2.5 inch SSD. Also, it weighs approximately six grams. The drive's compactness is well suited for most notebook PC designs, freeing up space for other components including the battery.

How to know the different between SM951and XP941
Most of the customer will ask how to know the different between SM951 and XP941. The most easy way is to check the part number, SM951 part number is MZHPV128HDGM and XP941 is MZHPU128HCGM. If you have more questions you may ask question here on amazon.

Function:
Supporting both PCIe 3.0 and PCIe 2.0 interfaces. For use in the latest ultra-slim notebooks, it can read and write sequentially at 1,600MB/s (megabytes per second) and 1,350MB/s respectively based on PCIe 2.0. This performance level is approximately three times faster than that of the latest SSD with a SATA interface and about 30 percent faster than that of the Samsung XP941, its predecessor. In addition, the new SSD’s random read and write speeds reach up to 130,000 and 85,000 IOPS (inputs/outputs per second) respectively.

Size
Samsung’s SM951 comes in the M.2 form factor (80mm x 22mm), which is only about one seventh the size of a 2.5 inch SSD. Also, it weighs approximately six grams. The drive’s compactness is well suited for most notebook PC designs, freeing up space for other components including the battery.

Customer reviews

4 out of 5 stars
192 global ratings

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Customers say

Customers praise the SSD's speed, noting read rates over 2 gigabytes per second and quick boot times. The drive works well with ASUS Sabertooth 3.0 motherboards and receives positive feedback for its hardware quality. Customers appreciate its compact size, comparing it to the size of a stick of gum, and consider it an excellent boot drive. Installation experiences are mixed, with some finding it easy to install while others report challenges. Value for money opinions are divided, with some considering it a great value while others find it pricey.

63 customers mention "Speed"58 positive5 negative

Customers praise the SSD's speed, with read rates exceeding 2 gigabytes per second and quick boot times.

"Pros : Really fast, small, motherboard attached, and bleeding edge tech. Boots on Asus X99-E WS and runs like a scalded Ape...." Read more

"I bought the SM951 because it offers read and write performance that is incredible...." Read more

"...The SM951 has remarkable speed, using Samsung Magician V4.6 to measure speed against the 850 Pro we have this: SM951 sequential read 2234 mb/s,..." Read more

"...After transferring Win 10 the SM951 I found that it boots very quickly ! Usually boots Win 10 in 10 to 11 seconds...." Read more

32 customers mention "Functionality"29 positive3 negative

Customers report that the SSD works great with no issues, particularly on ASUS Sabertooth 3.0 motherboards, and one customer mentions it runs smoothly with Windows 7.

"This SSD works great and I was surprised how small it was. I dare say it's smaller than laptop memory!..." Read more

"...No issues . The bad news is that the published Passmark score is 10,600 and I only got 7072...." Read more

"...Worked without issue on MSI X99s SLI Plus motherboard BIOS ver 1.7/1.8. Blazing fast...." Read more

"...edit 2/27/2016: still working great with no issues." Read more

11 customers mention "Hardware quality"11 positive0 negative

Customers praise the hardware quality of the SSD, with one customer noting it runs solidly and another mentioning it's the best thing for operating systems.

"...Quality Apps to support your SSD: "AS SSD Benchmark" to benchmark your HDD and SSD's. &..." Read more

"...this little drive to various frankenstein like tasks and it's running solid and true." Read more

"...These are the next best thing to having your operating system on a striped RAID on an Avago/LSI or Adaptec card with 16 ports and a Samsung or..." Read more

"...extremely helpful, and this product arrived very fast, and in perfect condition...." Read more

10 customers mention "Boot drive"10 positive0 negative

Customers find the SSD to be an excellent boot drive, with one customer noting it's great for SFF builds.

"...This is a high score given the Video card. This is a fast M2 harddrive device!..." Read more

"These are ABSOLUTELY WONDERFUL. The read rate is over 2 gigabytes per second...." Read more

"...Great boot drive - Extremely fast - Performance increase barely noticeable to 99% of users coming from a SATA III 6G SSD -..." Read more

"Fantastic Drive!..." Read more

9 customers mention "Size"9 positive0 negative

Customers appreciate the SSD's compact size, comparing it to the size of a stick of gum, with one customer noting it fits perfectly in the M.2 header.

"...I dare say it's smaller than laptop memory! But man, it was sure a whirlwind to install!..." Read more

"Pros : Really fast, small, motherboard attached, and bleeding edge tech. Boots on Asus X99-E WS and runs like a scalded Ape...." Read more

"...It's incredibly sleek and small so it's barely noticeable mounted to your motherboard and it's also lightning quick(see attached image) for great..." Read more

"...It's literally the size of a stick of gum and fit perfectly in the M.2 header on my motherboard...." Read more

18 customers mention "Ease of installation"11 positive7 negative

Customers have mixed experiences with installing the SSD, with some finding it very easy to set up while others report challenges with the process.

"...Easy to physically install in desktop with the Lycom DT-120 M.2 PCIe 3.0 adapter that I bought (because my cheap ASUS MB didn't have a M.2 slot)..." Read more

"...But man, it was sure a whirlwind to install!..." Read more

"...this yesterday on an MSI X99S SLI Plus MOBO and had no trouble installing windows 8.1, which only took about 3-4 minutes from USB Flash drive...." Read more

"...This drive is for you. If you're looking to install a program very fast. this is for you. If you're looking for a product that makes zero noise...." Read more

16 customers mention "Value for money"9 positive7 negative

Customers have mixed opinions about the storage drive's value for money, with some finding it a great value while others consider it a little pricey and not worth the money.

"For best speed and value. I don't need 400GB capacity on my system SSD then the Intel one is not a good choice given the budget...." Read more

"...Definitely not worth the money for me...." Read more

"...of a solid state drive running on pci-e instead of sata, it's worth the trouble." Read more

"...I came home yesterday, and all my source video's were gone, complete loss, nothing in the recycle bin, and the application logs on the same drive..." Read more

Super fast (at distruction)
1 out of 5 stars
Super fast (at distruction)
I bought the SM951 because it offers read and write performance that is incredible. As a basis for comparison, I used CrystalDiskMark to compare it to the Seagate 600 SSD I have as my main boot disk, a and RamDisk (DDR3 1600). The results are rather impressive when compared side by side. Samsung SM951 Sequential [MB/s]: 1253 Read / 1229 Write RamDisk (DDR3 1600) Sequential [MB/s]: 3283 Read / 4765 Write Seagate SSD Sequential [MB/s]: 464.9 Read / 391.5 Write Note that a RamDisk is really just a driver that enables me to use my computers memory like a disk. It's naturally faster, but does rely on an HDD to persist data, so I don't recommend using one for actual storage, but they are handy if you need to perform fast reads/writes . Now for the reason for the 1 star rating: The problem is that I had installed my programs, and started using the drive for video remuxing. I came home yesterday, and all my source video's were gone, complete loss, nothing in the recycle bin, and the application logs on the same drive also gone. Digging into what the likely reason is, but I am considering a return :(
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Top reviews from the United States

  • Reviewed in the United States on July 23, 2015
    This SSD works great and I was surprised how small it was. I dare say it's smaller than laptop memory!

    But man, it was sure a whirlwind to install! After pouring through tutorials and forums post, it took me around a day and a half before Windows 7 finally installed was running at max speeds. I'm using it with the MSI X99S SLI PLUS motherboard, and could not find settings like, "Secure Boot" or "CSM" in my BIOS as online tutorials said to change. So I started playing with things on my own. Here were the steps I took to get it installed:

    Opened Disk Management
    Deleted the partition on my flash drive
    Right clicked on it and choose "Convert to GPT"
    Converted the Samsung SSD to GPT as well.
    Formatted flash drive with FAT32.
    Found Windows 7 iso file online.
    Extracted the iso file with Magic ISO onto my flash drive.
    Copied the folder efi > microsoft > "boot"
    Pasted that folder in the "efi" folder. (Essentially, created a copy of the "boot" folder just 1 level up in the folder hierarchy.)
    Opened the file, sources > "boot.wim" with the program, 7 Zip.
    Within 7 Zip, selected the file, 1 > Windows > Boot > EFI > "bootmgfw.efi"
    Extracted the file to the folder, efi > "boot"
    Renamed the file, "bootmgfw.efi" to "bootx64.efi"

    This prepared the flash drive with a UEFI installation of Windows 7. For those Windows 8.1 users, it looked like this process was a LOT simpler.

    Then I went into the BIOS and set these settings:
    Settings > Advanced > PCI Subsystem Settings > M.2 Source Link > [PCH]
    Settings > Advanced > PCI Subsystem Settings > M.2 CH Strap > [M.2 PCH PCIE]
    Settings > Advanced > Integrated Peripherals > SATA Mode > [RAID Mode]
    Settings > Advanced > Integrated Peripherals > sSATA Mode > [ACHI Mode]
    Settings > Boot > Boot mode select > [Legacy+UEFI]
    Settings > Boot > Boot Option #1 > [Hard Disk:SAMSUNG MZHVP256HDLG-000]

    From there, I disconnected all SATA drives, except my old boot SSD (which was left plugged in by accident. Not sure if that mattered).
    Then I plugged in my flash drive into my front of my computer I boot it to with the F11 boot menu.
    Went through the Windows installation steps, and choose Advanced Setup.
    Choose Samsung SSD. (There was also a 100MB MBR partition there, I just ignored it and installed Windows on the spare unallocated space.)

    That last step took a LONG time to get to work. I kept getting an error that a driver was missing. After spending several hours trying to above steps all over again, I left the computer off for awhile. When I came back, I tried again, with the only thing changed was my flash drive was in the front of my case and it worked! Not sure if flash drive being thrown off which port it was plugged into, or if the computer power in the SSD needed to be drained for awhile.

    After Windows installed, sequential read and write speeds were only 700MBps and 600MBps. Much faster than my old SATA II SDD, but not nearly the speed I was promised. I played around in the BIOS I changed these settings:

    Settings > Advanced > PCI Subsystem Settings > M.2 Source Link > [Auto]
    Settings > Advanced > PCI Subsystem Settings > M.2 CH Strap > [M.2 PCH PCIE]
    Settings > Advanced > Integrated Peripherals > SATA Mode > [RAID Mode]
    Settings > Advanced > Integrated Peripherals > sSATA Mode > [ACHI Mode]
    Settings > Boot > Boot mode select > [UEFI]
    Settings > Boot > Boot Option #1 > [UEFI Hard Disk: Windows Boot Manager]

    The first M.2 Source Link was the main setting that fixed the problem. After that I got 1900MBps and 1200MBps sequential read and write speeds. MUCH better!

    Hopefully someone with my setup with have a easier time with this guide. Sure wish I had one.
    5 people found this helpful
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  • Reviewed in the United States on April 21, 2015
    I have been building computers since 1985, so I know a thing or two about how they operate. I installed this module in my new MSI X99S SLI Plus system (i7 - 5930K, 32gb DDR4), and no matter what I do in the BIOS settings, I can't get this thing to go any faster than a standard SSD drive. Maybe you'll have luck with a different board, but I'm certainly not impressed. Definitely not worth the money for me.

    At the advise of another fine reviewer, I just tried out the AS-SSD Benchmark program, and the following are my results:

    Seq: 1854.87 MB/s (read), 1022.14 MB/s (write)
    4K: 34.31 MB/s (read), 100.59 (write)
    4K-64 Thrd: 669.55 (read), 314.35 MB/s (write)
    ACC time: 0.056 m/s (read), 0.035 m/s (write)

    While the Seq readings are close to what the manufacturer advertises, I can honestly say that I don't "feel" any major difference in the speed of day to day work. It's faster than my Samsung 850 EVO 500gb SSD, but again, not impressively faster. Your call whether to buy it or not.
    9 people found this helpful
    Report
  • Reviewed in the United States on April 24, 2015
    First experience with this drive on an Asrock Z97 Extreme 9.

    Computer would post and attempt to boot, when booting from a USB windows install media it would see the drive but would not allow installation onto this drive due to "Firmware issue that prevents windows from booting from this drive".

    When going into the bios to select it as a bootable drive, the bios would lockup at a black screen with a white pointer. 1 in 5 bootups I could get into the bios, but would not recognize the drive in either M2 slot on this board (the 2x or the 4x).

    I started with bios version 1.14 and upgraded to 1.30 to try to fix the issue to no avail.

    This drive is an upgrade replacement to an XP941 M2 pcie SSD thats the same size (256gb), so I know both M2 slots are working perfect.

    The drive I received has firmware BXW2500Q 2015.03 but seems more or less DOA. I can't find anywhere online to download an upgrade or downgrade firmware for these drives.

    Update: received a beta bios from Asrock and the SSD is functioning now (without uefi support though) but at least I know it's a bios issue and not a hardware issue.
    18 people found this helpful
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Top reviews from other countries

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  • Gideon Roemer
    5.0 out of 5 stars Sehr schnell und bootfähig
    Reviewed in Germany on May 9, 2015
    Nachfolger der XP941, einfach einzubauen, wird von Asrock mit Chipsatz Intel X99/2011-3 sofort erkannt und ist ohne Probleme über PCIe 3.0 bootfähig. Ich werde mir diese SSD ohne Frage auch für die neue Generation 1151 mit Skylake für meine weniger leistungsstarken PC holen. Für alle Vorgängergenerationen dürfte sich der Kauf für eine echte Leistungssteigerung nicht lohnen, da die SSD dann über SATA/PCIe 2.0 angesteuert wird und ihre Leistung nicht ausspielen kann.
    Nachtrag aufgrund von Nachfragen: Ob die SM 951 über die M.2-Schnittstelle als schnelles bootfähiges Laufwerk über PCIe3 x4 erkannt/unterstützt wird, kann man bei den Herstellern an deren Storage Support List erkennen. Nur wenn dort das UEFI/BIOS die SSD als bootfähig erkennt und über PCIe3 x4 ansteuert, kann es als schnelles Laufwerk "C:"/System genutzt werden. Mit der kommenden massiven Unterstützung von PCIe3 durch die neue Intel Skylake-S Platform müsste das Problem, dass einige BIOS z.B. von einigen ASUS-Motherboards die SSD nicht als bootfähig erkennen, der Vergangenheit angehören. Achtung: Diese SSD (erkennbar an der Produktkennung "MZHPV" statt "MZVPV") unterstützt das gängige AHCI-Protokoll. Samsung hat schon einen Nachfolger, der das neue NVMe-Protokoll mit noch besseren Schreibraten unterstützt. Ob und wie diese SSD, die mit vier PCI-Express-3.0-Bahnen angebunden werden muss, von den neuen Boards unterstützt wird, weiß ich leider nicht. Also: bei Kauf auf die Produktkennung achten.
    Report
  • Gabriele
    5.0 out of 5 stars Velocità sovrannaturali!
    Reviewed in Italy on March 12, 2016
    Dopo varie ricerche online si siti di tutto il mondo, mi son deciso ad acquistare questo capolavoro di tecnologia, vera perla e forse l'unico punto di svolta nella tecnologia dei computer negli ultimi anni.
    Acquistato insieme alla scheda Lycom dt 120 per aggiornare un mac pro del 2009, sono rimasto sbalordito dalla semplicità di installazione ma soprattutto dall'incredibile velocità con cui tutte le operazioni vengono svolte. Sono passato, ad esempio, da un'attesa di circa 2 minuti per l'accensione, a circa 10 secondi!
    Customer image
    Gabriele
    5.0 out of 5 stars
    Velocità sovrannaturali!

    Reviewed in Italy on March 12, 2016
    Dopo varie ricerche online si siti di tutto il mondo, mi son deciso ad acquistare questo capolavoro di tecnologia, vera perla e forse l'unico punto di svolta nella tecnologia dei computer negli ultimi anni.
    Acquistato insieme alla scheda Lycom dt 120 per aggiornare un mac pro del 2009, sono rimasto sbalordito dalla semplicità di installazione ma soprattutto dall'incredibile velocità con cui tutte le operazioni vengono svolte. Sono passato, ad esempio, da un'attesa di circa 2 minuti per l'accensione, a circa 10 secondi!
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  • LPBB
    5.0 out of 5 stars Fonctionne avec Asus N751JX
    Reviewed in France on October 14, 2015
    Cette version AHCI fonctionne avec Asus N751JX et donc probablement avec le G771 également.
    Attention, la version NVME ne sera probablement pas détectée par le bios.
    Les débits mesurés avec HDTune tournent autour de 800Mo/s.
    Clonage fait avec TrueImage 2016.
  • Paul
    5.0 out of 5 stars I love it, great performance; make sure you support M.2 before ordering.
    Reviewed in Canada on August 24, 2015
    Awesome speeds, decent price, fast shipping. No problems with the installation on Win 8.1.

    If you're motherboard doesn't support M.2 (most don't yet), make sure you get yourself an M.2 PCIe adapter card at the same time. I was a little sad that I couldn't use it when it arrived (but I didn't do my research...). I went with this one: http://www.amazon.com/gp/product/B00RTSFLBY?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00 - The heat sink is just stupid as it does nothing, but the adapter card didn't give me any problems.

    C:\WINDOWS\system32>winsat disk -drive v
    Windows System Assessment Tool
    ...
    > Disk Random 16.0 Read 1575.58 MB/s 9.1
    > Disk Sequential 64.0 Read 2190.57 MB/s 9.1
    > Disk Sequential 64.0 Write 1326.34 MB/s 8.7
    > Average Read Time with Sequential Writes 0.135 ms 8.7
    > Latency: 95th Percentile 0.478 ms 8.7
    > Latency: Maximum 2.238 ms 8.8
    > Average Read Time with Random Writes 0.124 ms 8.9
    > Total Run Time 00:00:03.33
  • Doctor Traktor
    5.0 out of 5 stars Velocidad en tu MacPro 4.1
    Reviewed in Spain on May 2, 2017
    Una de las ampliaciones que se puede hacer en un MacPro 4.1 o 5.1 es añadir una memoria M2 para aumentar la velocidad de lectura y de escritura. Este tipo de memorias ssd tienen dos tipos, las AHCI las NVME. La diferencia, en lo que ha montar en un MacPro se refiere, es que la AHCI permite el boot de arranque y las NVME no.
    Si vas a montar esta memoria en un MacPro 4.1 o 5.1 asegúrate que la memoria es la MZHPV , ya que sino tu ordenador no arrancará.
    Luego hace falta un adaptador, como el Lycom DT-120 para que funcione.
    Adjunto velocidad de trasferencia en un MacPro 4.1
    Customer image
    Doctor Traktor
    5.0 out of 5 stars
    Velocidad en tu MacPro 4.1

    Reviewed in Spain on May 2, 2017
    Una de las ampliaciones que se puede hacer en un MacPro 4.1 o 5.1 es añadir una memoria M2 para aumentar la velocidad de lectura y de escritura. Este tipo de memorias ssd tienen dos tipos, las AHCI las NVME. La diferencia, en lo que ha montar en un MacPro se refiere, es que la AHCI permite el boot de arranque y las NVME no.
    Si vas a montar esta memoria en un MacPro 4.1 o 5.1 asegúrate que la memoria es la MZHPV , ya que sino tu ordenador no arrancará.
    Luego hace falta un adaptador, como el Lycom DT-120 para que funcione.
    Adjunto velocidad de trasferencia en un MacPro 4.1
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