With the new SATA 600 controller and USB 3.0 controllers we started adding SSD performance numbers measured on such interfaces (when applicable). Putting these in nicely styled charts would be better, but with technology so new we just do not have anything out there yet to compare to, so here are some raw peak performance numbers. We use an A-DATA N002 Solid State Drive which has both a both SATA2 and USB 3.0 port.
Above, you can see a N002 series A-DATA Solid State Drive running over the NEC USB 3.0 controller on this motherboard. The implementation works well.
Above some numbers based on the SATA3/6G/600 controller of this motherboard, the SSD is SATA 300, thus it will revert back to that mode. The end-result is okay, but not very good. The SSD peak levels should be reaching 250 MB/sec when it peaks.
Then again, for a setup like this it is nothing shamed about that performance. We measure in deliberately SATA2 mode here, not AHCI as most net-tops and net/laptops will be setup this way.