In our throughput test the drive peaked at 523.21MB/s (8MB block) during the read test before dropping back to finish the run at 520.79MB/s, both of these figures being faster than the official 480MB/s.
When it came to writes the drive peaked at 502.77MB/s, again at the 8MB block mark but this time the tested figure was somewhat shy of the official 550MB/s.