Performance vs. Transfer Size

ATTO is a useful tool for quickly measuring the impact of transfer size on performance. Similarly to the 840 Pro, the 840 is a high performer at small transfer sizes, which is an area I think too many SSD vendors are ignoring. Not all IOs are huge in size and while the small IO read/write speeds aren't big enough to be used for marketing, they play a role in real world performance. In write speed the 840 tops out at 250MB/s, which is low compared to many other SSDs but otherwise the 840 performs very well.

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AS-SSD Incompressible Sequential Performance AnandTech Storage Bench 2011
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  • Kevin G - Monday, October 08, 2012 - link

    On the fourth page:

    "With perfect wear-leveling and write amplification of 1x, you would get 256TiB of writes out of a 250GB Samsung 840 with TLC NAND and 1,000 P/E cycles. "

    Shouldn't it be 256 GiB?
    Reply
  • JarredWalton - Monday, October 08, 2012 - link

    No; he's accounting for the visible storage capacity (and spare area). So 250GB is 256GiB of NAND but only 250GB end-user storage. You can still write 256TiB of data (256GiB * 1000 P/E), which means on a 250GB SSD you end up with the ability to write 281TB of data (for an effective P/E cycles of 1125). Reply
  • schizoide - Monday, October 08, 2012 - link

    I'm not comfortable with TLC, particularly since it doesn't come at a huge absolute cost savings. I've been burned too often with SSDs, and now only buy the most bulletproof devices available. Maybe next generation. Maybe. Reply
  • Death666Angel - Tuesday, October 09, 2012 - link

    I wouldn't draw any conclusion for pricing just yet. Everyone is comparing street prices of current gen SSDs to MSRP of next gen SSDs. Give it a few months to get the 840 into stores and selling and then we'll se how prices fair.
    I'm personally fairly confident that there will be a distinct cost advantage.
    Reply
  • name99 - Tuesday, October 09, 2012 - link

    Have ANY SSDs given you a failure based on the flash cells themselves, rather than on crappy firmware?
    It's stupid to demonize a technology because some companies sold you a bad product --- especially when your response is to refuse to buy a product from a company that is known (in this respect at least) NOT to have shipped crappy firmware.
    Reply
  • harijan - Monday, October 08, 2012 - link

    Pretty sure 3650GiB != 3.65TiB.

    3650GB == 3.65TB.

    It doesn't do anything to your percentages, but this is Anandtech, we hold you to higher standards ;)
    Reply
  • Kristian Vättö - Tuesday, October 09, 2012 - link

    You are correct, I forgot that binary units don't scale up linearly (1000GiB is not 1TiB); metrics are just so much simpler. Thanks for the heads up, I've fixed the math now. Reply
  • iaco - Monday, October 08, 2012 - link

    I wonder if Samsung will ever make a SSD made of SLC NAND. The performance would be amazing. Reply
  • Conficio - Monday, October 08, 2012 - link

    First thanks to the Kristan and the Anand Team for another comprehensive review and the inclusion of in depth knowledge about the technology behind it.

    I'd like to see included in the test (or in another article) a review of the available tools for each SSD. I think it is important to know if the manufacturer supports its tools to low level format, secure erase, TRIM, ROM update etc. beyond the obligatory Windows (7). Are those available for Linux (command line and/or GUI)? Are they available for Mac OSX? Do they work if the drive is connected over USB? Are these tools user friendly to use?

    It is useless if I buy an SSD and have to find out that Mac OSX does not support the tools. I have a couple of Vertex drives which I can't find a way to secure erase in order to restore full performance. They are pre TRIM drives and Mac OS X does not support trim on them anyway.

    As with motherboards, the the BIOS or UEFI is important, so is with SSDs the ability to actually perform some of the low level functions. I hope you can add that to your workload! A comparison of the different tools for each manufacturer for current drives would be a great start. Thanks again!
    Reply
  • Kristian Vättö - Tuesday, October 09, 2012 - link

    Samsung will be releasing Magician 4.0 later this year and we are definitely going to do an article about it. I tried to get a beta version of it but Samsung wasn't willing to send us one, yet. Magician 3.2.2 that comes with the 840 is the same that's available for the 830, so I didn't find it that important to cover.

    But you are right, we need to cover the software side more as well because it will also drive manufacturers to make their own SSD tools.

    P.S. Try installing Ubuntu to a USB stick (just use UNetBootin) and then use hdparm commands (see below) to secure erase the SSD.

    sudo hdparm --user-master u --security-set-pass password /dev/sdX

    sudo hdparm --user-master u --security-erase password /dev/sdX

    "password" is whatever you choose as the password and "X" is the drive (you can see which it is in Disk Utility)
    Reply

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