Right after the Vertex 4, OCZ released the Agility 4. Traditionally the Agility series is a bit slower than the Vertex series but therefore they charge less for these drive. Never the less, at 410 Megabyte per second sequential write, 420 Megabyte per second sequential read as well as 48'000 IOPS randon read and 85'000 IOPS random write the drive is everything but slow.