Installed my first ever SSD. Here are my benchmarks

Bought a Samsung 850 EVO (250GB). Below are the benchmark stats:

Sequential Read - 394 MB/s (Up to 540)
Sequential Write - 378 MB/s (Up to 520)
Random Read (IOPS) - 56144 (Up to 97000)
Random Write (IOPS) - 34321 (Up to 88000)

Are these results what are expected for an SSD?

I have the same SSD running my OS. I've have just run two CrystalDiskMark benchmarks with differing loads for you + There are two from Samsung Magician from back when I had just installed it and another one from just now. As you can see I'm getting higher marks than you across the board. I have little knowledge on how you can better this, but here are two possible explanations.

  • Make sure it's connected to a SATA 3 (6Gb/s) port?
  • Is the SDD filled to the brim without Over Provisioning? (Use Samsung Magician to reserve Over Provisioning space which is used for moving stuff around internally in the SSD)

Samsung Magician from when the SSD was just installed.

Sequential Read - 551 MB/s (Up to 540)
Sequential Write - 523 MB/s (Up to 520)
Random Read (IOPS) - 99024 (Up to 97000)
Random Write (IOPS) - 86525 (Up to 88000)

(Yes it's the correct numbers, it does score above the limit on all but the last one)


Samsung Magician Benchmarks from just now.

Sequential Read - 552 MB/s (Up to 540)
Sequential Write - 468 MB/s (Up to 520)
Random Read (IOPS) - 97445 (Up to 97000)
Random Write (IOPS) - 75368 (Up to 88000)

So it seems the write speeds have suffered a bit since the first benchmark.


CrystalDiskMark 3.0.4 x64 (C) 2007-2015 hiyohiyo

  • MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 510.442 MB/s
Sequential Write : 346.608 MB/s
Random Read 512KB : 449.988 MB/s
Random Write 512KB : 316.801 MB/s
Random Read 4KB (QD=1) : 32.561 MB/s [ 7949.5 IOPS]
Random Write 4KB (QD=1) : 63.693 MB/s [ 15550.0 IOPS]
Random Read 4KB (QD=32) : 405.792 MB/s [ 99070.4 IOPS]
Random Write 4KB (QD=32) : 267.252 MB/s [ 65247.1 IOPS]

Test : 4000 MB. C: 42.6% (92.1/216.2 GB) (x5)


Sequential Read : 506.558 MB/s
Sequential Write : 403.350 MB/s
Random Read 512KB : 453.099 MB/s
Random Write 512KB : 335.725 MB/s
Random Read 4KB (QD=1) : 35.245 MB/s [ 8604.7 IOPS]
Random Write 4KB (QD=1) : 60.369 MB/s [ 14738.6 IOPS]
Random Read 4KB (QD=32) : 403.967 MB/s [ 98624.9 IOPS]
Random Write 4KB (QD=32) : 293.921 MB/s [ 71758.0 IOPS]

Test : 1000 MB. C: 42.5% (91.9/216.2 GB) (x5)


Date : 2015/07/23 12:16:05
OS : Windows 7 Professional SP1 6.1 Build 7601

A tad low for that SSD - Whats your specs and do you have AHCI enabled in bios?