The CDM benches are within a margin of error of each other. The drives had quite a bit less data on them in the second benches too. ATTO really sucks as a benchmark though tbqh, and is not to be trusted if you're looking for a realistic representation of the performance of the drive because of the highly compressible nature of the data that it uses. Do you have CnQ enabled? Have you tried AS SSD? Were the drives secure erased before either of the tests? Are the partitions on the drives aligned? Are you sure sata3 is enabled? If you pick 0 fill in CDM, do the numbers look closer to ATTO? Try Anvil's bench or straight Iometer.
You have to remember that these are SSDs and, in raid especially, are not going to show the same bench results on every bench run. Writing a lot to the drives in a given day can easily explain a 200MB/sec drop in seq reads. I've seen it time and time again, on 4+ drive setups at least. Heck, if you left your system completely idle overnight and ran the benches again you'd probably see better numbers too. These are also sandforce based drives and will respond much differently with compressible vs incompressible data.
--Matt
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