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.
ADATA rate the drive as capable of up to 85,000 IOPS with their own 4k Random write test, but with our settings it achieved 66,491 IOPS, which is actually a very good result.