Yapt (yet another performance test) is a benchmark recommended by a pair of drive manufacturers and was incredibly difficult to locate as it hasn’t been updated or used in quite some time. That doesn’t make it irrelevant by any means though, as the benchmark is quite useful. It creates a test file of about 100 MB in size and runs both random and sequential read and write tests with it while changing the data I/O size in the process. The results are a good look at overall drive performance.
With Yapt we saw better results for sequential than for random despite the fact that this is very large block random access taking place (which appears more sequential to an SSD). Given the sequential read issues we saw previously, I would have expected the opposite, but something about the Vertex 4 firmware in its current state of tune is not meshing well with this particular benchmark. There are clear differences between the two, yet in Sequential Writes you can see a clear dip at the 2MB block size that is exactly mirrored across both firmwares.