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Samsung 860 Pro 1TB SATA III SSD Review (Page 7)

By Jon Coulter from Jan 23, 2018 @ 9:00 CST
TweakTown Rating: 98%Manufacturer: Samsung

Iometer - Maximum IOPS

Version and / or Patch Used: Iometer 2014

We use Iometer to measure high queue depth performance. (No Partition)

Max IOPS Read


Max IOPS Write


The numbers we are getting here match exactly what we saw from our Anvil's IOPS testing. This indicates that the 860 Pro does not slow down at all when data is on the drive.

Iometer - Disk Response

Version and / or Patch Used: Iometer 2014

We use Iometer to measure disk response times. Disk response times are measured at an industry accepted standard of 4K QD1 for both write and read. Each test runs twice for 30 seconds consecutively, with a 5-second ramp-up before each test. We partition the drive/array as a secondary device for this testing.

Avg. Write Response


Avg. Read Response


This testing bypasses any SLC buffer that may be on the drive which is why the buffer-less 860 Pro is delivering better 4K QD1 random read response than Intel's 545s. This backs up our earlier assessment that the 860 Pro's QD1 random read performance is more realistic than what we were seeing from the 545s with our CDM testing. This is because data is only read at SLC speeds if it has already been written to and still resides in the drive's SLC buffer. The read response delivered by the 860 Pro is again a new lab record for SATA when running Windows 10.

DiskBench - Directory Copy

Version and / or Patch Used:

We use DiskBench to time a 28.6GB block (9,882 files in 1,247 folders) composed primarily of incompressible sequential and random data as it's transferred from our DC P3700 PCIe NVME SSD to our test drive. We then read from a 6GB zip file that's part of our 28.6GB data block to determine the test drive's read transfer rate. Our system is restarted prior to the read test to clear any cached data, ensuring an accurate test result.

Write Transfer Rate


Read Transfer Rate


When testing write transfer rates we have a rule of thumb. If any SSD cannot achieve 200MB/s with our write transfer test, that SSD will not receive a TweakTown recommendation. There are many TLC SSDs that do not pass our minimum, but we didn't include those on our chart. Additionally, we recently updated to Windows 10 Anniversary Edition and with that update, sustained write performance greatly increased. This means our previous transfer tests cannot be compared with those run on the newer version on Windows 10. This is the reason we have drive's that differ from the rest of the review on this chart.

The 860 Pro delivers the best-read transfer rate for any SATA SSD we've tested to date. The drives on our chart that are powered by Micron and SanDisk 3D flash deliver better write transfer rates than the 860 Pro.

PRICING: You can find the product discussed for sale below. The prices listed are valid at the time of writing, but can change at any time. Click the link below to see real-time pricing for the best deal:

USUnited States: The Samsung 850 PRO - 1TB - 2.5-Inch SATA III Internal SSD (MZ-7KE1T0BW) retails for $545.99 at

UKUnited Kingdom: The Samsung 850 PRO 1 TB 2.5 inch SATA III Solid State Drive retails for £260.00 at

CACanada: The Samsung 860 Pro 1TB SATA III SSD retails for $ CAD at

We openly invite the companies who provide us with review samples / who are mentioned or discussed to express their opinion. If any company representative wishes to respond, we will publish the response here. Please contact us if you wish to respond.

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