CrystalDiskMark is an easy-to-run and quick utility to use to gauge a drive’s performance. It measures sequential read and write performance and random read and write speeds of random 4KB, 4KB (queue depth 32) and 512KB data.
Performance on CrystalDiskMark was generally impressive. The Samsung SSD 840 Pro recorded the highest sequential read and write speeds and its showing on the 512k workload was admirable too. Performance dipped a little on the 4k workloads - write speed was considerably below par compared to the OCZ and the rest of the SandForce drives. However, it redeemed itself on the more intensive 4k, 32 queue depth workload, posting very competitive read and write speeds.