AS SSD is a great free tool designed just for benching Solid State Drives. It performs an array of sequential read and write tests, as well as random read and write tests with sequential access times over a portion of the drive. AS SSD includes a sub suite of benchmarks with various file pattern algorithms but this is difficult in trying to judge accurate performance figures.
AS SSD works with incompressible data and this drive scores very well in the sequential tests, at around 495 MB/s read and 345 MB/s write.
Above, some results from other drives, including the Corsair Performance Pro 256GB, which uses the Marvell controller. The Corsair drive is noticeably faster, especially with the 4k-64Thrd tests.