Crystal Disk Benchmark is used to measure read and write performance through sampling of raw (0/1 Fill/compressible) or random data which is, for the most part, incompressible. When testing SSDs such as the Performance Pro where there is no compression utilized in storage, test results for both compressible and incompressible data are strikingly similar.
These are excellent scores for any SSD, especially when looking at the high sequential and 512k write scores where most typical SSDs would be lucky to be just above 300MB/s. We also liked the 4k random write transfer speed of 75MB/s.
Up until recently, AS SSD was the only benchmark created specifically for SSD testing and it tests in the ‘worst case scenario’ for the most part with incompressible data.
Anyone who has been around the site for awhile and read a few of our reviews knows that we very rarely post AS SSD Copy Benchmark and Compression Tests scores. This is different though. This particular Compression Test is the best we have seen by far. This test uses incompressible data which makes great results particularly difficult. Normally, one might expect to see the write line start around the 180MB/s mark at the beginning of the transfer and reach high 300MB/s by the end, whereas here, its a straight and smooth line for both read and write. The dip was created when the test started its second pass which isn’t a concern. Here is a typical result: