IOMeter is another open source synthetic benchmarking tool which is able to simulate the various loads placed on hard drive and solid state drive technology.
We use a custom Kitguru configuration for 4k random write to measure performance. We use the same test, but for random read performance also.
IOMeter performance is strong with both read and write tests. Every manufacturer can give different claims, but there are various ways to configure the software to achieve a final score. We consider our results worst case scenario.