Samsung PM853T

Samsung PM853T
Capacity 240GB 480GB 960GB
Controller Samsung MEX
NAND Samsung 19nm 128Gbit TLC
Sequential Read Up to 530MB/s
Sequential Write Up to 410MB/s
4KB Random Read Up to 87K IOPS
4KB Random Write Up to 15K IOPS
Endurance (DWPD) 0.3 DWPD (4KB Random) / 1.6 DWPD (64KB Sequential)
Warranty Three years

The PM853T is the OEM version of the 845DC EVO and as you would expect, the two are very much alike. The difference between the 845DC EVO and PM853T is the firmware and the PM853T is geared more towards sustained workloads, which results in slightly higher random write speed (15K IOPS vs 14K IOPS) for the highest capacity. Endurance is also a bit lower (0.3 DWPD vs 0.35 DWPD) and warranty has dropped from five to three years, but otherwise the 845DC EVO and PM853T should be alike. Unfortunately I do not have the full data sheet, so all the specs are 'up to', but I will update the table when I receive the full specs. 

Samsung SSD 845DC PRO Performance Consistency - Average IOPS
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  • hojnikb - Wednesday, September 3, 2014 - link

    Looks like, they ain't doing Turbowrite on TLC models :) Reply
  • Kristian Vättö - Wednesday, September 3, 2014 - link

    TurboWrite wouldn't make any sense on an enterprise drive because all that matters is sustained performance. Client drives are a different case because IO activity tends to happen in bursts, so having a fast buffer is beneficial (and it makes the drive look better in benchmarks). Reply
  • hojnikb - Wednesday, September 3, 2014 - link

    Yeah i figured as much. Aside from being more suited for short bursts (as you'd said) its really great for marketing department, since they can slap magical 500MB/s+ speeds, that every uninformed buyer is after. 500MB/s sure sells a lot better than 250MB/s (or even less, if we're dealing with lower capacities) :) Reply
  • Spirall - Wednesday, September 3, 2014 - link

    Thanks for the article. Would suggest to make a $/manufacturer declared write endurance comparison (PB writen until manufacturer write warranty end). If there's a chance (due to the difficult on testing time) also make a $/tested write life (PB writen until tested dead). Reply
  • Kristian Vättö - Wednesday, September 3, 2014 - link

    $/endurance is certainly something I will be looking at in the future. This was more of a preview than a full review and in the full review I will have more graphs and comparisons to support the conclusions :)

    As for actual endurance testing, that is something I will not do. It took me two weeks of continuos writing to get the rated endurance to drop by 1% in the 845DC PRO, so it would take way too long to wait for the drive to die.
    Reply
  • hojnikb - Wednesday, September 3, 2014 - link

    And there is a good chance, that thing would still go strong after rated endurance would drop to 0% (unless its hardcapped to die after that). Reply
  • Essence_of_War - Wednesday, September 3, 2014 - link

    Another excellent article, Kristian.

    A question/comment, though, do you think it would make more sense to report the stdev measurements as an "error bar" attached to each data point rather than an additional graph with a 2nd y-axis? I think that might be more compact without having to worry about having multiple y-scales to read. Then it might even be possible to plot an average + error bars data set for multiple different SSDs on the same axis w/o having to worry about which curve is the avg, which curve is the stdev, etc.
    Reply
  • hulu - Wednesday, September 3, 2014 - link

    Another way to present the standard deviation data would be to draw it in two average +/- stdev graphs above and below the average graph. This would better allow visualizing the actual values the average minus stdev has. Reply
  • Kristian Vättö - Thursday, September 4, 2014 - link

    Thanks for the suggestion. I will certainly look into alternative ways to present the standard deviation. I need to redo the graphs anyway for our new suite, so while I'm at it I can see if there is a better way to present the data. Reply
  • Essence_of_War - Thursday, September 4, 2014 - link

    Best luck then, I'm sure you'll figure out a good way to do it. Reply

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