Hi, I understand the limitations of a SATA II bus, with a SATA III drive. However, will there be any improvement with a Samsumg 840 PRO vs an older Samsung 830 (both 128gb) on a Mac Pro (obviously all SATA II)? Even if you don't have an 840 PRO, can speed differences between drives be noticed/measured, or does the SATA II bus limit the difference between different fast SATA III drives anyway? As i'll probably upgrade to whatever 2013 Mac Pro is released, i don't mind paying the extra for something that i can take over to a new machine in a year, bit i'm just curious. The price difference could tempt me to just get the 830 if they drop in price any more though, if there'll be no difference in performance on a SATA II machine (which i'll probably be using for another year or so) Cheers!