AS SSD is a benchmark that uses non-compressible and completely random data. What this means is that the drives using the SandForce SF-2281 controller cannot compress the data first, which takes away one of the strong advantages of this controller. Therefore this is a useful benchmark because drives that use the SF-2281 controller don't gain an upper hand.
On the Copy Benchmark, Samsung SSD 840 Pro performed admirably and was able to challenge the Corsair and OCZ drives. It was a tad slower on the Program benchmark, but it was on a par with the Corsair and OCZ drives on the ISO and Game workloads and was miles ahead of the other SandForce-powered drives.
On the sequential workload, the Samsung SSD 840 Pro recorded very high read and write speeds. Write speed, in particular, was outstanding as it nearly broke the 500MB/s mark. Performance on the 4k workload was a little underwhelming, but the Samsung drive redeemed itself on the more demanding 4k, 64 threads workload, posting impressive read and write performance. It’s 4k, 64 threads write performance measurement of 391MB/s was a whopping 18% faster than the second-placed OCZ Vector.