Samsung 850 EVO Series SSD Review – 120GB and 500GB

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A Closer Look at the Samsung 850 EVO Drives:

Each drive is disassembled with three screws on the back plate – two of which are hidden under the product sticker. These screws are the pentalobe Torx types which are apparently also very soft and easily stripped to hell. Ask me how I know.

Samsung 850 EVO PCB

These screws also serves as mounting points for the PCB in each drive. As you can see, both are very small with the 120GB version on the left being much more so and virtually no components on the back side. The 500GB version has two NAND packages on this side.

Samsung 850 EVO PCB

Flipping them over, we find more NAND, the cache chips and the controllers on each.

Samsung 850 EVO NAND

The TLC NAND on each drive is Samsung’s 32 layer 3D V-NAND with part number K90KGY8S7C. This is the first consumer device on the market equipped with such hardware. Each are 128GB in density so the 120GB only has one and the 500GB drive carried four. This NAND uses about half of the power of the more common Planar 2D NAND and is a key reason the drives consumer very little power comparatively overall.

Samsung 850 EVO Cache

The cache chips are different capacity depending on the overall drive capacity which is quite common. For the 120GB drive it’s 256MB, for the 500GB and 250GB drives it’s 512GB, and for the 1TB drive it’s 1GB of LP-DDR2 DRAM cache memory. Unless our sample drives are outfitted differently, it’s odd that the cache chips on the 120GB and 500GB drives carry the same part number codes etched on the surface.

Samsung 850 EVO Controller

The Samsung MGX controller, an evolution from the MCX, MDX and MEX controllers, is making its debut on this 850 EVO drive. Well, for all but the 1TB drive at least. That particular one features the MEX controller we’ve seen previously. What exact changes there are between the MEX and MGX controllers isn’t being shared but it’s likely the same triple-core ARM design as the MEX controller with subtle differences. We do know that the MGX controller still offers the same great features such as TurboWrite, TRIM and garbage collection support, as well as AES 256-bit encryption as well as TCG/Opal V2.0.

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  • This is the exact product that you must purchase if you are truly into experiencing the fastness of the ever changing world. If you have had a hard time with the traditional disk drives, Samsung SSD 850 Evo series is the best budget-performance-oriented solution available.

    Thanks to the high reliability and the excellent build quality, EVO 850 is a product which you cannot easily hate. With the wide variety of capacities available from EVO series, I have bought the 120 GB version and it has given me every little point to be satisfied with the money I spent.

    Of course my requirements could be different from yours and it all depends on how you want to handle the need of a fast storage.

    Meanwhile, there are many sellers online, selling products but you have to be precise in choosing the best available seller to purchase. Gear Best offers decent services and I have been highly satisfied by their service. And the good news for you is that they do sell this little storage warrior. At the moment, they are offering a flash sale and it could end at anytime. Check the link given below and you will be good to go and buy it from them. Trust me, they are awesome (telling by experience)!

  • yahay

    great review … this is so more than enough

  • KatVON0

    Thank you very much for your Samsung SSD
    reviews. Your description is really complete. With your detailed description, I
    think I can easily know which of them is more proper for me to instead my old
    WD external hard drive like:
    Hope all of these listed options are good
    to go on.

  • Matias

    Very complete review! Thanks