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.
Results are mostly what we expect here except for the spread in the Random Write test. This test is not 4k aligned, and as a result shows how various drives perform when the written data is offset from the typical 4k access / alignment used in a modern OS. Lesson: ensure you align your SSD partitions or bad things happen.