Sequential Read Performance

For full details of how we conduct our Iometer tests, please refer to this article.

Iometer - 128KB Sequential Read

Most modern SATA drives have more or less the same sequential read performance and the 2TB Pro and EVO are no exceptions. Samsung drives do consume quite a bit of power under sequential read operations, but fortunately the 2TB EVO shows efficiency gains over the 1TB model.

Iometer - 128KB Sequential Read (Power)

Samsung 850 Pro 2TB

Nothing special in the scaling graphs -- both the Pro and EVO reach their maximum at QD2.

Sequential Write Performance

Iometer - 128KB Sequential Write

Once again, the performance of 2TB models is equal to 1TB with the EVO having increased power efficiency.

Iometer - 128KB Sequential Write (Power)

Queue depth scaling is, unsurprisingly, similar to the smaller capacities.

Samsung 850 Pro 2TB
Random Performance Mixed Read/Write Performance


View All Comments

  • twizzlebizzle22 - Thursday, July 23, 2015 - link

    Damn, we are in the future here. Roll in the day when my media storage drives are all SSD.

    Interesting as to why they managed to double the drive durability from 150TB to 300TB. That's pretty substantial.
  • joex4444 - Thursday, July 23, 2015 - link

    Durability is the amount of data that can be written to the drive Samsung is guaranteeing can be written to it during its life. It's just related to the number of times a chip can be completely rewritten. If you double the capacity, you double the number of chips, and therefore you double the durability. Reply
  • lilmoe - Thursday, July 23, 2015 - link

    Sure, but Samsung is also setting the older 512GB and 1TB at 300TB endurance rating up from 150TB previously, which is nice. Reply
  • SleepyFE - Friday, July 24, 2015 - link

    If i'm not mistaken that was a marketing move. The EVO was sold as 150 so that people who needed more would buy PRO. There was a super punishing SSD test half a year back (a bit less maybe) where they tested how much the drives can take before the cells give up and even the EVO held out beyond 300. So they didn't really manage to improve anything, they just decided to extend their guarantee. Reply
  • leexgx - Saturday, July 25, 2015 - link

    EVO not as reliable as the Pro (TLC EVO vs MLC PRO,) the pro drive never failed with bad data it silently failed at 2PB

    the endurance is for warranty before where they have found errors have cropped up, the PRO drive use MLC so is reliably less error prone (as in they handle any minor errors better then TLC) then EVO under extreme loads (drives might look the same but the flash is not)
  • leexgx - Thursday, July 23, 2015 - link

    sorry if this is been asked before, is the 25% OP been done via the ATA command that allows you to set amount of useable space or are you just partitioning it (both after a Secure erase) Reply
  • Samus - Thursday, July 23, 2015 - link

    You don't even need to go that far. The Samsung Magician toolbox allows you to set a RAW OP "partition" Reply
  • leexgx - Thursday, July 23, 2015 - link

    i looked online i guess it worked as i thought it would, you can use ATA LBA limit command to hard limit the OP space or just make the partition say 20GB less then the size of the SSD (or what ever size you want) this is assuming its a fresh drive or secured erased state, but the thing is TRIM does the same thing any way (assuming you don't fill the drive so it runs out of space) if you cant use TRIM then you need to set higher OP space (recommended any way) Reply
  • TEAMSWITCHER - Thursday, July 23, 2015 - link

    Not quite yet.... I've been limping along with a pair of 840 EVO's waiting for this Samsung 3D flash in an m.2 form factor with a PCIe x4 with NVMe controller. All of this technology is mature, and my motherboard has the m.2 slot and BIOS support for NVMe, but Samsung hasn't put it all together yet. I'm not shelling out any more money for SATA III SSDs when I feel that any time now...Samsung will introduce the product I've been hoping for. Am I foolish to think this product in imminent? Reply
  • Impulses - Thursday, July 23, 2015 - link

    Hmm, I'm not sure anyone could really say... It's plausible they might skip retail availability of the SM951 AHCI & NVMe versions altogether and release something with 3D NAND this year, but I think they haven't released the former to begin with because the demand just isn't there outside of OEMs.

    Might change after Skylake, might not, I doubt the average enthusiast is chomping at the bit to pay $1/GB for a drive but I dunno how much cheaper the SM951 would be in volume. I'm just aiming for a 256GB SM951 post-Skylake, for the OS, paired with 850 EVOs for storage.

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