I just got back from Seoul last night where Samsung held their SSD Global Summit for the first time. As a souvenir, Samsung gave us all an 840 SSD because they were only able to ship 840 Pros for the initial reviews. While I haven't had time to run the 840 through all of our tests yet, I just finished running our Storage Bench suite and thought I would give you a quick teaser on its performance:

Samsung SSD 840 Specifications
Capacity 120GB 250GB 500GB
Sequential Read 530MB/s 540MB/s 540MB/s
Sequential Write 130MB/s 250MB/s 330MB/s
4KB Random Read 86K IOPS 96K IOPS 98K IOPS
4KB Random Write 32K IOPS 62K IOPS 70K IOPS
Cache (LPDDR2) 256MB 512MB 512MB

Heavy Workload 2011 - Average Data Rate

The 840 is very close to the 840 Pro in terms of read performance but since our Heavy suite consists of lots of writes, the 840 can't challenge the 840 Pro. Some of this can be due to the firmware but I'm betting the biggest reason is the use of TLC NAND. Read latency isn't affected that much by the third bit per cell but erase and program times are considerably longer (50% increase in write latency), which results in worse write performance.

Light Workload 2011 - Average Data Rate

Our Light suite is more read centric, which is a good thing for the 840; only the 840 Pro is faster than it. Samsung's engineers also said that they specifically concentrated on read performance on the 840 because it's aimed towards consumers whose usage is often very read centric. I can definitely agree with their engineers and I think Samsung's current lineup is very logical: Cheap TLC based SSD for consumer with good read performance and a more expensive but all-around high performance drive for enthusiasts and professionals.

Our full review will be up soon, so stay tuned!



View All Comments

  • mapesdhs - Friday, September 28, 2012 - link

    Could you please include the Sandisk Extreme model(s) in your reviews please?
    As one of the lowest priced 240GB SSDs available atm, I'd be most interested to
    know how it compares to the more expensive options.

  • sunshinerag - Friday, October 5, 2012 - link

    Getting impatient here .. eagerly awaiting the full review. :) Reply

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