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.
In the more stringent AS SSD test the write score of 425 is stronger than the 407 of Samsung's 850 EVO but the roles are reversed when it comes to read performance.