AS SSD (incompressible data)
AS SSD uses incompressible data. SSDs with a SandForce controller (like the OCZ Vertex 3, Intel SSD 520, and many others) can therefore not take advantage of the built-in compression tricks.
AS SSD performs both read and write tests. First it tests 4kB data blocks with one command at a time, then it tests 4kB data blocks with 64 simultaneous commands. Lastly, it performs a sequential read and write test, which measures how well the SSD works with very large files. Based on all the tests, AS SSD also gives an aggregate score.
For the first time we measure a total score above 1,000 points, which is very impressive. When we look at the sub-scores, it becomes clear that the Vertex 4 is extremely fast at reading 4k data blocks, both with a single command and with a queue depth of 64. Writing 4k blocks is faster with one command at a time, and with 64 threads even a new record is set. Also important to note is the fact that the Vertex 4 512GB sets a new record for sequentially writing incompressible data (444MB/s).