CrystalDiskMark tests read and write performance with incompressible data using different random block sizes and sequentially. Characteristically, the Synapse drive performs slower than the other high end OCZ SSD drives. It has one die per flash channel, which translates into slower 4K QD=32 (higher outstanding IOPS) performance. And the usage of asynchronous NAND results in slower performance in general when incompressible data is being transferred. But the Synapse cached solution still beats the pants off the traditional hard drive on its own.
FutureMark's PCMark 7 Pro has a useful storage benchmark. It tests read and write patterns of commonly used functions that computer users will encounter regularly. While most of the other tests show the raw performance of the drives, PCMark helps to translate that performance into how it will affect daily functions. The Synapse Cache solution performed well in the PCMark 7 tests, achieving similar results to the other standalone SSDs, while felling a bit behind for the "Starting Applications" and "Importing Pictures" tests. But the main story is the performance benefit the Synapse drive adds to the traditional hard drive. In all of the tests, the Synapse combo easily beats the standalone hard drive. The most noticeable improvement for users will be the fast application loading speeds and shortened boot times, which was tested to be 12x faster with the Synapse drive than without it.