USB Flash Drive Roundup
 

Now, we start to see the pack thin out, as the clear performance leaders are reduced from over a dozen down to a few: Lexar's JumpDrive Lightning, Memina's Rocket, Kingston's DataTraveler Elite and OCZ's 2GB Rally drive.

Once we get lower than the Flash Voyager on the list, that's when we see performance drop into the single digit MB/s transfer rates.

http://www.anandtech.com/memory/showdoc.aspx?i=2549&