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Samsung 850 EVO and Pro 2TB SSD Review – 2TB SSDs Make their Entry

If you look back over the past several years, there have always been three constants that needed to be addressed in order for SSDs to become a viable consumer solution to storage; value, reliability and capacity.  One of our first SSD reviews was on an MTron 32GB SSD with a whopping price tag of more than $1500…and they sold!  Both value and reliability have come along and, I guess, capacity has for the most part as well since we can get a 1TB SSD for under $500.  Settling into the digital age logically means that we have much more pictures, videos and music to store and many find that even 1TB is not enough. Along comes Samsung with the 2TB Pro and EVO SSDs.

Samsung Pro and EVO 2TB SSD Exterior Cases

Both the Samsung Pro and the Samsung EVO go on sale very soon in a 2TB capacity and the only way a company could have reached this capacity point in a typical notebook SSD is with 3D V-NAND technology. 3D V-NAND memory has the ability to increase capacity through stacking 32 cell layers on top of one another vice beside, resulting in a higher density and better performance in a smaller footprint.  Would you believe Samsung could fit 4TB of memory into the same notebook SSD Case?  That is a fact as the PCB in use is much smaller than the typical PCB in both length and width.

Samsung Pro and EVO 2TB SSD Mini PCB 4TBCapable

The MSRP for the 2TB versions of the Samsung Pro and EVO is $799.99 and $999.99 (Check Amazon Now) bringing the price point of SSDs down to an incredible low of .39/GB and that is at MSRP.  Performance of the pro is listed at 550MB/s read and 520MB/s write with the EVO only differing by 10MB/s read at 540MB/s. IOPS for both are very similar and up around the 100K mark, however, different capacities of both do account for different performance somewhat:


EVO Performance


850 EVO Performance

Both the Pro and EVO have full TRIM support, Garbage Collection, S.M.A.R.T. attributes, AES 256-bit Full Disk Encryption which is expected as both use the same controller. The only difference between both SSDs is whether it is 3D-VNAND two or three bit memory. Also, the 850 Pro has the maroon square on its exterior, whereas the EVO’s is gray.

Samsung Pro and EVO 2TB SSD Front

As the 850 EVO uses 3-Bit MLC 3D V-NAND memory, its TBW (terabytes written) rating is 150TBW, whereas the 850 Pro is double that at 300TBW.  Conversely, the 850 EVO has a slight advantage in power ratings at 3.3W average/3.4W maximum with the 850 Pro at 3.7W average/4.7W maximum.

The 850 EVO has a five-year warranty where the Pro doubles that to 10 years.


Neither of the Samsung 850 PCBs are full size and each measures 2.75″ long by 2″ wide.  Both contain the same 3-core SATA 3 controller bearing product number S4LP052X01-8030 and this specific controller resembles that of the lower capacity models but has been modified for the higher 2TB capacity. Both also contain 4 chips of 3D-VNAND memory on each side, each chip representing 256GB of RAW capacity.



Samsung Pro 2TB SSD PCB FrontSamsung Pro 2TB SSD PCB BackThe sole difference between these two SSDs is the memory.  The 850 Pro contains 2-Bit MLC, whereas the EVO contains 3-Bit MLC (as Samsung likes to term it).  Both have an available capacity of 1908GB once formatted.


Samsung EVO 2TB SSD PCB FrontSamsung EVO 2TB SSD PCB BackAnother first on the 2TB 850 Series SSD is that both are the first in the industry to contain 2GB DRAM Cache memory chips. Let’s take a look at how the memory chips differ by product number, the 850 pro on the left and the 850EVO on the right:

Samsung Pro MemorySamsung EVO 2TB SSD MemoryFor the purpose of our benchmarks today, we will test the 850 Pro followed by the 850 EVO.   Just as a bit of a heads up, the performance of both is very similar.

  • Benjamin Hojnik

    To be frank, V-NAND was not needed for 2tb ssd.
    Manufactureres can easily stuff 16 packages each having 128GB space using plain ol’ 2d nand.

    • Yes but…the problem then becomes one of performance versus the ability to provide the necessary power to the chips don’t you think? And how about DEVSlp?

      • Benjamin Hojnik

        If sandisk managed to make 4TB ssd with ordinary 2d flash, i’m sure sammy could aswell.
        But in just happens that there was no demand, when 19nm was still a thing with samsung.

        And i dont think 3d is all that more power efficient compared to 2d to be an excuse…

        What about devsleep ? Care to elaborate ?

      • renosablast

        To compare apples to apples, the SanDisk 4TB was originally shipped as a 15mm ‘z’-height form factor, as opposed to 7mm ‘z’-height for the Sammies. I do believe that SanDisk now fits 4TB into a 9mm ‘z’-height form factor. Those “taller” ‘z’-heights won’t be fitting into too many laptops or other portable devices.

      • The 4 TB SSD was a dual PCB design and could never fit into a notyebook case. Further, it was noit a consumer SSD. I don’t think with the powering needs of an SSD with so many chips can DEVSLP be an option; I could be wrong.

      • Benjamin Hojnik

        Well, with 3D there are still the same amout of chips or dies compared to 2D.

        Remember, 3D NAND has the same die size as 2D — 128Gbit.
        So for 2TB, they need the same number of dies, be that 3d nand or 19nm 2D.

        And fitting physically so much space was never a problem of chip density. We can do 256GB per package for quite some time now (840evo msata anyone ?).
        If we put aside controller and heat limitations, we could put 4TB of flash on a standard 2.5″ formfactor , if there was demand for such drive.

      • SteelCrysis

        Actually, according to a comment by Paul Alcorn from Tweaktown, the SanDisk 4 TB SSD has 3 PCBs:

  • Terry Boyer

    nice review les, Might these drives push the 1/2 tb models finaly closer to the $200 price point? Im still running on my Mushkin Cronos Deluxe 120 … but I think its getting long in the tooth & while I think a move to a 256 gig SSD would probly be financialy better for me … I notice the 1/2 tb’s are getting around the $300 mark. Also my other issue is im again if you remember running a AM3+ FX cpu, so im not 100% committed to replacing the board with Zen just over a year away. Sugestions?/thought?


    • I don’t really think so. As much as we enjoy seeing the lower per GB point, these drives do not compete as they are still niche and in their own space IMO.

      • Eric Wi

        I do not understand how ordinary consumers feel content with new computers coming off the shelf as sluggish as it were 5 years old. In actuality I HAVE put them in 5 year old machines and it’s much much faster than those new budget machines.

  • Vlad Bieg

    Not to hijack the discussion – but any M.2 SATA 850 Pro or EVO with higher capacity, or are we stuck forever at 500GB? The technology appears to me similar, yet Samsung M.2 reached 500GB some time ago and stopped.

  • Antox

    No newer FW-version than the one which bricked a lot of users’ 850 Pros (luckily my update went well) huh?

  • SteelCrysis

    “Samsung has set a new bar in SSD pricing”

    Are you kidding? The best bar that the Samsung 2 TB SSDs set is $0.40/GB. The competition’s 960 GB/1 TB SSDs regularly hit $350-$380, the Crucial M500 960 GB was $295-$305 until recently. This is the 840 Series all over again, where reviewers gave Samsung and their 840 Series TLC SSDs all the credit for the SSD price drops that the Crucial M500 series started.

  • Georgeeeee

    so…. where can i buy 1 of these Beast_

  • Argh

    Why are the PCB photos of EVO rotated the other way of the PRO? It makes it difficult to compare the chips of EVO and PRO, or was that the point?

  • rob108

    Can I partition this SSD as a logical drive? I have a 500GB 850 EVO

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