Samsung 845DC EVO SSD Review: 3-Bit MLC Hits The Enterprise

Inside Of Samsung's 845DC EVO

Opening up the 845DC EVO gives us flashbacks to our coverage of the 840 EVO. Its PCB and general layout, along with most of the components, are identical. Samsung's consumer-oriented 840 EVO employs a smaller PCB, which creates more empty space inside the 2.5" chassis. But the 845DC EVO's circuit board is larger to accommodate the power-loss protection capacitors, filling the enclosure.

Samsung's 845DC EVO uses the same MEX 400 MHz triple-core Cortex-R4-based controller (labeled S4LN045X01-8030) as the 840 EVO.

Also, the same 1 GB of LPDDR2 DRAM cache is present on the largest 845DC EVO model.

As mentioned in the introduction, Samsung's 845DC EVO employs 3-bit-per-cell NAND. Our 960 GB review unit includes 1024 GiB of raw flash capacity. Each of the on-board packages contains eight dies, with 16 GiB per die. The spare area (12.7%) is greater than what the 840 EVO (9.05%) offers, helping improve consistency and extend the NAND's life.

In the above shot, you can see some of the 23 power-loss capacitors used to keep the SSD's controller running just long enough, in the event of an outage, to flush all pending writes.

Overall, Samsung appears to take a direct approach to the 845DC EVO's design, only making changes deemed absolutely necessary. After all, the 840 EVO is already a fairly mature platform.

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  • SteelCity1981
    So basicly it's the more durable version of the 840 evo much like opertons and xeons are to the FX and core i7 series.
    3
  • Plusthinking Iq
    like we know now after the ssd endurance test samsung is the worst enterprise candidate.
    -8
  • drewriley
    Anonymous said:
    So basicly it's the more durable version of the 840 evo much like opertons and xeons are to the FX and core i7 series.


    Yes, that's a fair analogy. Just like the Xeon E3-1275v3 is an i7-4770K, but with ECC support.
    3
  • damric
    I've yet to see an SSD fail due to read/write endurance. I only see them fail when the controller gets bugged, which seems to happen all the time, especially on loss of power.
    2
  • soundping
    I'm guessing this SSD doesn't have to new firmware code that extends life and speed.
    0
  • jase240
    Another win for the EVO. This SSD modified for enterprise workloads makes it a good buy for webservers.

    Hopefully the price will go down after launch, and then I see this being the best choice of webhosts.

    Cheaper and adequate for that workload.
    0
  • Nightmare Twily
    Eh I'll keep my 840 EVO 250GB
    0
  • Nuckles_56
    "Even still, I wand to commend Samsung's execution." (last page 1st paragraph) I guess that is supposed to be want, unless Drew Riley has become a wizard now :D
    0
  • Menigmand
    Commending their execution would be a bit harsh, don't you think?
    0
  • drewriley
    Anonymous said:
    Commending their execution would be a bit harsh, don't you think?


    I'm sure worse things were said about Samsung at WWDC '14 yesterday ;)
    0
  • drewriley
    Anonymous said:
    "Even still, I wand to commend Samsung's execution." (last page 1st paragraph) I guess that is supposed to be want, unless Drew Riley has become a wizard now :D


    Now that you mention it.....
    0
  • eriko
    4KB random write, and average response time.

    Nuff said.

    You'd have to be out your mind to put TLC in a a critical environment.
    -1
  • patrick47018
    @eriko everyone's critical environments need a little tender loving care
    1
  • photonboy
    The 845dc isn't necessarily the "worst enterprise candidate"; for one thing it wasn't the bottom in every test.

    For another, it's more about VALUE and that's the main point of the article. I assume the top SSD's in this category were MLC not TLC and also more expensive.
    1