Now Reading
Samsung 840 Pro Series 256GB SSD Review

Samsung 840 Pro Series 256GB SSD Review

Sam ChenNovember 20, 2012

The Magic of Samsung

A number of weeks back, I had the wonderful opportunity of reviewing the famous Samsung 830 SSD and while the drive is still in the upper echelon of drives with all things considered, the performance of the drive just isn’t up to snuff when put in comparison to all the new drives popping up on the market these days. After all, the Samsung 830 was unveiled about a year ago, and in technology years, a year is a long time.

So right now, I’m sitting here in Seoul, Korea witnessing the launch of Samsung’s newest SSD, the Samsung 840 and the Samsung 840 Pro. Yes, that’s right people, Samsung is introducing two SSD models – one model geared towards the general user, the Samsung 840, which is a 21nm TLC (Triple Level Cell) Toggle NAND based SSD, while a second model is geared towards enthusiasts/enterprise, the Samsung 840 Pro, which is based off of Samsung’s new 21nm MLC Toggle NAND.

Now Samsung is quite proud of their new SSD offerings, and with good reason too. Like the Samsung 830, the Samsung 840/840 Pro is designed and manufactured completely in house. There’s no sourcing of controllers from 3rd parties such as Marvell or SandForce, and there’s no sourcing of NAND from 3rd parties such as Toshiba/SanDisk or IMFT. This means that Samsung is able design, manufacture and handpick NAND that’s most compatible with the controller/firmware and has the luxury of spending tons of time in validation testing. Moreover, Samsung is also better equipped to fix any SSD issues that crop up on a timely basis as they don’t need to rely on a 3rd party to help push out new firmware. This is very important especially for those who remember all the flak OCZ took with their SandForce based Vertex 3.

That said, today we’ll be reviewing the Samsung 840 Pro SSD, Samsung’s top tier 840 series SSD geared towards enthusiasts and enterprise applications. Before getting any further, let’s take a look at a specifications comparison between the older Samsung 830 SSD and the new Samsung 840 Pro SSD. For our comparison, we’ll only do a comparison between the 256GB edition of the drives, but be aware that both the Samsung 830 and Samsung 840 Pro is available in a number of capacities.

Samsung 830 vs Samsung 840 Pro Specifications

Samsung 830Samsung 840 Pro
ControllerSamsung S4LJ204X01-Y040Samsung S4LN021X01-8030
NAND27nm Toggle Mode MLC21nm Toggle Mode MLC
Sequential Reads520 MB/s540 MB/s
Sequential Writes400 MB/s450 MB/s
Active Power Use0.24W0.068W
Idle Power Use0.14W0.042W
InterfaceSATA 3 6GB/sSATA 3 6GB/s

Overall, the specifications are a mixed bag here. Sequential reads are bumped up to a nice 540MB/s while sequential writes are only bumped up to 450MB/s. That said, do remember that the Samsung 840 Pro will perform identically for both incompressible and compressible data. While SandForce drives are typically able to reach a maximum of 500MB/s+ sequential reads/writes, they can only reach the 500MB/s+ throughput when the data transferred is compressible.

Also important to note is the power usage here. As the Samsung 840 Pro is 7mm in thickness, it’s quite apparent that it was designed with notebook users in mind. As such, any amount of power savings however slight will amount to at least some battery life savings. According to Samsung’s specifications, they’ve managed to shave off about 72% power draw under load and about 70% power draw when idle, which should significantly impact battery life on notebooks.

With all that, let’s take a look at Samsung’s new 840 Pro SSD and see if it’s a worthy successor to the Samsung 830.

About The Author
Sam Chen
Hardware and Technology Enthusiast. SSD Evangelist. Editor-in-Chief. You can find Sam's full biography here
  • Darrell

    What a crazy performance! Now we see the ultimate SSD within SATA3.

  • Matteo Soprano

    This is definitely the most powerful SSD on the market. I’m gonna buy the 256Gb version but I’d like to see a review of the 840 (no-Pro) just to realize if this Pro model is worth the extra money.

    • The non-pro wasn’t ready when I published this article, but I’ll be getting my hands on a non-pro edition soon enough so a review will be available shortly. From what I’ve been seeing/hearing at Samsung’s SSD summit, the non-pro will have comparable performance to the Samsung 830, but significantly better random read/write performance.

  • Albin Lindqvist

    So how long do u think it’ll take for the 256gb Pro version to get to the 830’s current price point, or do u think it’ll get even lower? I don’t really want to wait too long.

    • That I can’t say for sure since the 840 and 840 Pro won’t be retailing until next month (October), but the Samsung 840 is expected to be hitting the 830’s price point right out of the gate with the 840 Pro costing around a 30% or so premium over the 840. I wouldn’t be surprised if the 840 Pro were to hit current 830 price points by Q1-Q2 of next year though.

      • Albin Lindqvist

        Ok, thx hopefully it’ll get pretty good pricing anyway or I’ll go for the regular 840 instead

        • Yup. We shall see in 2-4 weeks. I started some testing on the standard 840 already and it’s very fast as well. Samsung did sacrifice a little bit of sequential writes since TLC NAND is supposedly ~50% slower than 2 bit/cell MLC, but sequential reads, 4k read/writes are quite close in comparison to the 840 Pro.

  • Jon

    Impressive test result.
    Probably the best SSD out there.

    The score in AS SSD is the best I have seen so far.

    I wonder , what version of Intel RST are you using in the test ?

    • As reported through Anvil Storage Utilities, these results were obtained using RST v11.2.0.1006

  • Anony

    Wtf? You can buy 2 Samsung 840 Pro 256GB drives for $540. But a 512GB drive costs $600. Somebody failed math class :-(.

    • Darrell

      And you failed your economics class.

  • Dan

    Agree that the 840 is good product. But this is a biased, at least a narrow minded, review. should cover more in depth about TLC vs MLC, and data from Passmark.

    • Darrell

      You are just confusing 840 Pro and 840. 840 Pro uses MLC.