The next software we used was the ATTO Disk Benchmark. The tool measures storage systems performance with various transfer sizes and test lengths for reads and writes. The benchmark performs file transfers ranging from 0.5 KB to 8192 KB. ATTO can be adjusted to do overlapped I/O, in a variety of queue depths. We tested the SSD using the benchmark's default settings, using 256KB file length performance and QD4. ATTO probably gives the most accurate results for compressible read and write data.

As you see above the drive's reading and writing performance with compressible files was pretty stable with files larger than 64KB. The reading speed hit the 565MB/s and the writing speed reached the 535 MB/s.

The Samsung 850PRo 256GB reached the top of the chart in the 4K read test, but suffered a bit in the sequential writing of 4KB:

On the other hand, the Crucial MX100 drive was fast when it was writing such small, compressible files:

Going further to larger file transfers, the Samsung SSD excelled in both read and write tests: