Crucial v4 (256GB) Reviewby Kristian Vättö on November 22, 2012 1:01 PM EST
AS-SSD Incompressible Sequential Performance
The AS-SSD sequential benchmark uses incompressible data for all of its transfers. The result is a pretty big reduction in sequential write speed on SandForce based controllers, while other drives continue to work at roughly the same speed as with compressible data.
Switching to incompressible data yeilds results similar to our IOmeter sequential tests. Sequential speeds are definitely not an issue as performance is close to what you would get from any drive running at SATA 3Gbps speeds.