After shipping two generations of M.2 drives with PCIe interfaces for OEM customers, Samsung is releasing a PCIe drive to the retail market which has the added benefit of including the latest features Samsung offers. The Samsung 950 Pro is the new flagship consumer drive and it eschews the backwards compatibility and the 2.5" SATA form factor of the three previous iterations of the 8xx Pro family in favor of a PCI Express 3.0 x4 connection in the M.2 2280 form factor coupled with the NVMe protocol. Those changes allow for one of the biggest generational performance jumps in the history of the SSD industry and should help the transition of SSDs shedding the last vestiges and limited feature sets of their mechanical hard drive predecessors.

The M.2 2280 form factor has the potential to unify the consumer SSD market, with a physical size small enough for ultrabooks but a large enough capacity for all users. M.2, depending on the exact implementation used by the OEM, has the ability to provide SATA or high-performance PCIe connectivity, easing the transition. By supporting up to four lanes of PCIe 3.0, M.2 has helped make the two-lane SATA Express standard dead on arrival and ensures that drives won't be starving for bandwidth again for quite some time.

Meanwhile, high-end SSDs have been struggling to squeeze every last drop of performance out of the 6Gb/s SATA III interface. While some vendors have put out M.2 PCIe devices that support two lanes of PCIe, Samsung went straight for four lanes with the XP941 drive for OEMs to start. This was then upgraded to PCIe 3.0 speeds with the SM951. Earlier this year, they implemented the NVMe protocol which allows the SM951 to make use of the available bandwidth of the PCIe 3.0 x4 link. With Intel's Skylake platform bringing plentiful I/O bandwidth to support multiple lanes of PCIe 3.0 to more than just the graphics card, a good number of external bottlenecks are bypassed and Samsung can stretch the true capabilities of the hardware. This is a main focus of the 950 Pro.

Samsung SSD Comparison
  950 Pro
950 Pro
SM951-NVMe 512GB (OEM) 850 Pro
Form Factor M.2 2280 2.5" SATA
Controller Samsung UBX Samsung MEX
Interface PCIe 3.0 x4 SATA III
Protocol NVMe AHCI
DRAM 512MB 512MB 512MB
NAND Samsung V-NAND 32-layer 128Gbit MLC Samsung 16nm 64Gbit MLC Samsung V-NAND 32-layer 86Gbit MLC
Sequential Read 2,500MB/s 2,200MB/s 2,150MB/s 550MB/s
Sequential Write 1500MB/s 900MB/s 1,550MB/s 520MB/s
4KB Random Read (QD32) 300K IOPS 270K IOPS 300K IOPS 100K IOPS
4KB Random Write (QD32) 110K IOPS 85K IOPS 100K IOPS 90K IOPS
Power 7.0W (burst)
5.7W (average)
1.7W (idle)
6.4W (burst)
5.1 (average)
1.7W (idle)
8.9W (peak) 3.3W (read)
3.0W (write)
0.4W (idle)
Encryption AES-256, TCG Opal 2.0 N/A AES-256, TCG Opal 2.0
Endurance 400TB 200TB N/A 300TB
Warranty 5 Year N/A 10 Year
Launch Date October 2015 ~June 2015 July 2014

The 950 Pro is using the same UBX controller as the SM951, but pairs it for the first time with 3D NAND. We first saw Samsung's 128Gb 32-layer V-NAND in the 2TB 850 Pro, introduced about a year after the original 850 Pro. None of the major components of the 950 Pro are entirely new, but this is the first consumer level product to combine them. The 950 Pro is an aggressive push forward; it's a bit risky to be bringing so much new tech in one product to the unforgiving retail market. Samsung will bear the brunt of any immaturity or incompatibilities, but they are hoping to lead the way for a much broader shift in the market.

PCI Express has been around for a long time and offers forward and backward compatibility, but until very recently most systems only offered 16 lanes from the processor, mainly for graphics cards, and one-lane slots for anything else from the chipset. With Intel's Haswell generation of processors the SATA Express connector and M.2 slot started appearing, but systems with a four-lane PCIe 3.0 connection available (and with enough overall bandwidth to fully feed it) are still quite rare. As a result, most consumers could only get that much bandwidth from one of their graphics card slots, moving any discrete graphics card to half PCIe bandwidth. This changes with Skylake and the 100-series chipsets that can support 20 PCIe 3.0 lanes of connectivity through the chipset, and up to three PCIe 3.0 x4 drives in Intel's RST mode for RAID combinations.

The 950 Pro is the new flagship, but it is certainly not a replacement for the 850 Pro. The pricing reflects that: $200 MSRP for the 256GB and $350 for the 512GB is about 50% higher than current retail prices for the 850 Pro, which is still one of the top performing consumer SSDs. Samsung is betting that the market is ready for a new premium category that's meant to be a part of the newest and fastest machines.

The 850 Pro will be sticking around in its current role, and as it's refreshed to use the 128Gb V-NAND the range of capacities will expand further, with a 4TB model of the 2.5-inch drive due in early 2016. The switch to 128Gb V-NAND may also allow prices to drop and widen the gap between the 850 Pro and the 950 Pro.

AnandTech 2015 SSD Test System
CPU Intel Core i7-4770K running at 3.5GHz (Turbo & EIST enabled, C-states disabled)
Motherboard ASUS Z97 Deluxe (BIOS 2501)
Chipset Intel Z97
Chipset Drivers Intel 10.0.24+ Intel RST
Memory Corsair Vengeance DDR3-1866 2x8GB (9-10-9-27 2T)
Graphics Intel HD Graphics 4600
Graphics Drivers
Desktop Resolution 1920 x 1200
OS Windows 8.1 x64
Testing With NVMe Over PCIe


View All Comments

  • ElBerryKM13 - Saturday, November 14, 2015 - link

    If you had $1000 to spend which one would you get? this 950 pro m.2 or intel 1.2TB m.2? Reply
  • srieppo - Monday, December 21, 2015 - link

    Get two 950 in RAID 0. I'm currently running that and it's amazing. What you should put money on depends on your needs though. For gaming SSD is not very important. But I already run 6700k with fast memory and 980TI SLI so was a logical next step.

    1TB of superfast SSD is the last bit. HDD for storage, power options to shut the HDD down when idle (silent) and online backup for important data is the way I like...
  • mapesdhs - Monday, December 14, 2015 - link

    Typo on pp. 9, the word "duplicating" is shown twice, or was that a really late April Fool? :D Reply
  • mapesdhs - Tuesday, December 15, 2015 - link

    Pondering whether to get a 950 Pro 256GB for a SkyLake laptop (MSI GE72 6QF). Despite the glowing benchmark results, it looks as if there would be little gain for real world usage compared to, say, an 850 EVO M.2 which is way cheaper (132 UKP for 500GB, vs. 147 UKP for 950 Pro 256GB), uses less power and thus would afford longer battery life. Edging towards the 850 EVO despite my nerdy addiction to speed... Reply
  • Killerkicker2011 - Wednesday, December 30, 2015 - link

    Would the 950 pro work with my Macbook Pro Late 2013? Reply
  • Quarysma - Saturday, January 16, 2016 - link

    I bought 950 pro but i having trouble rate. My system test results as follows:836 / 806 MB/s read/write.
    My system: Asus Z97m plus, 2*8 Corsair 2400 Mhz. i5-4690K, Corsair h110i, 1000W PSU.

    I wonder why I'm having problems ?

    Thanks for all...
  • robitlgnaz - Tuesday, February 2, 2016 - link

    I have Asus Z97 deluxe with m.2 slot, but supporting only x4 PCI 2.0 (instead of x4 PCi 3.0).
    So on my mobo and yours too this m.2 support only 1.0Gbit or 1.000MB.;(

    I think (and asking) that with PCIe adapter i and you can put that in x8 lanes of PCI 2.0 and get full spedd with that? I have only one graphics card so this is the only way, or?
  • Quarysma - Friday, February 26, 2016 - link

    Either we get PCI-e card or will switch to the DDR4 system. I moved to a DDR4 system.

    I'm ordered DDR4 system and waiting for the parts.
  • yury2808 - Tuesday, April 12, 2016 - link

    Beware! This drive (950 Pro / 512 GB) is terribly slow, if you set your disk to be "compressed" in Win7/10. I used it save my vmware space for years with other SSD drives (intel/samsung/ocz) and never had an issue.
    But yesterday, we got 2x nvme 950 pro and found, that speed is dropping almost immediately to ... 3 MB/s with huge latency.

    I don't know, how their firmware goes around benchmarks (which are all cool for 'incompressible' data) but for real life - this drive get a HUGE hit when OS compress data.

    ps. sure, I have plenty CPU for it, so it's not the case.
  • Redstorm - Saturday, April 23, 2016 - link

    Be aware the new Samsung NVMe driver 1.1 drops performance by about 10% across the board. They should update the article with new perf numbers as its giving a false impression ATM. Reply

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