I've seen this before with Intel's RST or something like FancyCache doing some funky things to benchmarking tools that are duped into thinking they're talking to a disk.
What you're measuring is the read/write performance of your system's DDR3 when the software has cached the entire test data.
I hear rig lists are all the rage, and I <3 the rage! Workstation = Black tower thing; HTPC = Shhhh!; Laptop - AMAZING FOLDING PC!