So I got excited to upgrade from a 128 GB RealSSD --> 256 GB Samsung 830. The drive is running the latest firmware, and I am running a fully updated version of OS X Lion. I ran the Black Magic disk speed test to get a feel for the new performance, and unfortunately I was only seeing my writes top out at 340 MB/s. Another thread on here had people speaking of ~ 390 MB/s writes. Could this be due to Filevault 2 being enabled on my SSD? My SSD is in the primary SATA III port.