Check out the following thread in the Titan upgrades forum. People there & here have complained about not noticing a difference with the new "offical" release and Rev A speeds. Per the Titan thhread I enabled and disabled to see if I noticed a difference in download speed, and I would have to say there was a slight difference (556kbs versus 349kbs on average).
http://forum.ppcgeeks.com/showthread.php?t=31214