The ATTO Disk Benchmark 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. The test was run with the default runs of 0.5KB through 8MB transfer sizes with the total length being 256MB and QD4. ATTO probably gives the most accurate results for read and write data.

Below you see the results of the Samsung 970 Pro 512GB with the older version of the ATTO Disk Benchmark:

The latest build of ATTO Disk Benchmark shows that the Samsung 970 Pro 512GB is hitting up to 3.2 GB/s read and 2.12 GB/s write at a queue depth of 4:

The 970 Pro SSD takes the overall lead in the read test, reaching high speeds even with smaller files, compared to the rest of the SSDs in the chart below:

In the write test, the 970 Pro SSD was slower than the Toshiba XG6 SSD: