Power Consumption

Samsung has always done a great job at power efficiency and the 850 EVO is no exception. In slumber mode the 850 EVO is one of the most efficient drives we have seen and it also explains why Samsung went with the new MGX controller as the 500GB and smaller capacities consume about 30% less power than the 1TB model.

Load power consumption is also exceptional, although once again I should note that the writes are hitting the SLC buffer, which is more power efficient than writing to the TLC array. Right after I stopped writing to the drive I saw the power consumption increase to ~3W while the drive was reading data from SLC and writing it to TLC, but that didn't take longer than 10-20 seconds or so (though it depends on how much you write to the drive). I have some tests prepared for our 2015 SSD suite that will look at power over time more closely, so it will also better account for SLC to MLC/TLC writes.

SSD Slumber Power (HIPM+DIPM) - 5V Rail

Drive Power Consumption - Sequential Write

Drive Power Consumption - Random Write

Performance vs. Transfer Size Final Words
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  • TEAMSWITCHER - Monday, December 8, 2014 - link

    I'm in complete agreement. I'm not going to buy another 2.5" SSD before I can get an 850 Pro (512 GB) equivalent with an M.2 interface. I have two motherboards with empty M.2 slots waiting for the market to catch up. I know about the XP941, but the pricing isn't great. M.2 drives should cost almost the same as a 2.5" drive...especially after eliminating the worthless metal/plastic box.
  • extide - Monday, December 8, 2014 - link

    Seems to me like TLC will become the standard mainstream for 3D/VNAND, where as MLC will be pretty much only for high end/enterprise, somewhat like SLC was back in the day.
  • MadDuffy - Monday, December 8, 2014 - link

    Newegg prices (USD) are up:
    120 GB - 90
    250 GB - 140
    500 GB - 250
    1 TB - 470

    Email I received indicates these are promotional prices available through Dec 14th
  • casperes1996 - Monday, December 8, 2014 - link

    Last page, fifth paragraph, last line:
    "If I was"
    Should be: "If I were"

    I know I'm a cunt for pointing it out, but I only do so because I generally think Anandtech offers fairly decently written articles, and I care too much about this sort of piss...
  • apudapus - Monday, December 8, 2014 - link

    How is data retention with this type of TLC NAND? Can the drive be powered off for a week or a month before data gets corrupted? While the drive is powered on, I assume there are refresh features for stale (a.k.a. infrequently accessed) data.
  • hojnikb - Monday, December 8, 2014 - link

    If its up to jedec (i imagine it is) then its good for atleast a year.
  • kgh00007 - Monday, December 8, 2014 - link

    But in reality what are they going to be like? I don't think I'll buy another Samsung TLC drive after owning the 120 GB 840 EVO for the last while! It performs erratically, especially when resuming from hibernate. It can take anywhere from 10 secs to boot, up to 5 minutes, and I have applied the latest firmware and run the speed recovery app from Samsung. I have an mSata Crucial m500 240GB which is slower on paper, but in reality is much quicker and the performance is 100% consistent, it does the same thing, every time at the same speed!!

    MLC all the way for me without any turbowrite nonsense, just straight forward advertised speeds across the whole drive all the time, without loosing data due to poor charge retention along the way!
  • Lolimaster - Monday, December 8, 2014 - link

    Your EVO is 120 and your other drive is 240, less nand, more erratic, simple. Look at the chart, you get consistent writes/read with 500-1TB models.
  • kgh00007 - Saturday, December 13, 2014 - link

    Less nand equals slower performance, not more erratic performance. But it should perform at it's given speed consistentantly. I have over 30% of the drive free and 10% set as over provisioning on the 840 EVO. There is no excuse for a 5 minute boot time with an SSD. I don't trust these Samsung drives after my experience!
  • mlkmade - Monday, December 8, 2014 - link

    So I'm confused as its not very clear...Is Turbowrite turned on for all your benchmarks?

    Is turbowrite needed to hit the the 540/520 read/write times? I saw the chart with TurboWrite on and off. So with turbowrite off this drive only gets 100mb/s ?

    This article is very vague in regards to that.

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