AS SSD is a benchmark that uses non-compressible and completely random data. What this means is that the drives using the 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 don't gain an upper hand.
Despite removing the advantages of the SandForce SF-2281 controller, the OCZ Agility 4 is clearly down on performance in comparison with the current crop of high-end enthusiast-grade SSDs, especially in terms of read performance. On a whole, the Agility 4 offered about 70% to 75% the performance of the Vertex 4. Even so, write performance is actually quite impressive as we can see on the sequential and 4K, 64 threads workloads, its write performance was on a par with the fastest SandForce drives.