ATTO uses data that is readily compressable. While this is what most manuf list as Advertized" performance, it is not realistic and does not represent real life usage performance.
A good example is the Agillity 3, great with ATTO, but run it on a benchmark that uses non compressable data and the Sequencial performance dropps considerably (AS SSD uses compressed data. (true for most SF22xx based controller using non-sync chips)
Real life for a OS + Program drive performance is closer tied to benchmark using compressed data. OS + program files overall are closer to, but not tollaly, uncompressable.