This was also true for the Plextor PX-G512M6e and the SATA SSDs.
In comparison, the Samsung SM951 reached just 686MB/s though the G.Skill Phoenix Blade did quite well reaching 774MB/s.
Despite the terrible read access time performance the Kingston HyperX Savage was rather snappy when measuring write access time.

Still it was the Intel SSD 750 Series that dominated here followed by the Samsung SSD 850 Pro.