Samsung 850 EVO SSD Review (120/500GB) – Showing Off 3D TLC V-NAND


Crystal Disk Benchmark is used to measure read and write performance through sampling of random data which is, for the most part, incompressible. Performance is virtually identical, regardless of data sample so we have included only that using random data samples.


Samsung 850 EVO 120GB Crystal Disk Mark


Samsung 850 EVO 500GB Crystal Disk Mark

In Crystal Disk Mark the 120GB 850 EVO achieved 537.9MB/s read and 525MB/s write, while the larger 500GB drive achieved 539MB/s read and 525.9MB/s write. These results are so close, even with the 120GB having only one NAND package. Samsung’s TurboWrite technology is putting in work!


The toughest benchmark available for solid state drives is AS SSD as it relies solely on incompressible data samples when testing performance.  For the most part, AS SSD tests can be considered the ‘worst case scenario’ in obtaining data transfer speeds and many enthusiasts like AS SSD for their needs. Transfer speeds are displayed on the left with IOPS results on the right.

The identified capacities are listed on each result…

Samsung 850 EVO 120GB AS SSD Samsung 850 EVO 500GB AS SSD

Samsung 850 EVO 120GB AS SSD IOPS Samsung 850 EVO 500GB AS SSD IOPS

In AS SSD, we can see the 120GB model reached a total of 1049 points and the 500GB model reached 1244 points. Sequential speeds reach around 515MB/s for reads and 500MB/s for writes. Now, this is where things start looking even better. 4K reads are reaching nearly 49MB/s! That is the fastest we have seen from any SATA 6Gb/s SSD! Following that, the 4K writes reach around 134MB/s. When looking at the 4K-64thrd test, you can see that the 120GB finally start to show weakness in writes due to the lesser number of NAND packages in the design.

As for IOPS, both capacities were just shy of their rated spec. We will see if Anvil’s Storage utilities can verify the spec. for us in a second.

Samsung 850 EVO 120GB AS SSD Copy Samsung 850 EVO 500GB AS SSD Copy

For our Copy Benchmark results both drives performed well. Again the 500GB model edging out ahead slightly in performance.


Anvil’s Storage Utilities (ASU) are the most complete test bed available for the solid state drive today.  The benchmark displays test results for, not only throughput but also, IOPS and Disk Access Times.  Not only does it have a preset SSD benchmark, but also, it has included such things as endurance testing and threaded I/O read, write and mixed tests, all of which are very simple to understand and use in our benchmark testing.

Once again, listed capacities are evident on each result…

Samsung 850 EVO 120GB Anvil

Samsung 850 EVO 500GB Anvil

With a result of 5,491.15 points the 500GB beats out the 120GB overall which achieved 5,471.54 in this test. Looking at 4K performance again, we see that both capacities were able to hit 50MB/s!  Lower by just a few percent, both drives reached slightly under their rated IOPS again.