Samsung 830 SSD in 11.10 - What speed should I see?

[traverlaw]

I installed a new Samsung 830 SSD (256 mb) 6Gb/s with a new install of 11.10 64-bit. I'm using SATA-III

I get the following results after running sudo hdparm -t /dev/sda

Timing buffered disk reads: 718 MB in 3.00 seconds = 239.15 MB/sec

This seems to be somewhat less than Samsung advertises for the drive.

Am I missing something?

Here is my installation procedure: http://www.reddit.com/r/Ubuntu/comments/q414e/how_i_painlessly_migrated_from_a_toolarge/

Edit: Solved - I replace the cable that I was using with the one that came with the SSD. Now it is more than twice as fast:

Timing buffered disk reads: 1478 MB in 3.00 seconds = 492.51 MB/sec