Originally Posted By: hybrid8
Apple has fixed the 1.5Gbit limitation for the SATA controller in an EFI firmware update.

This one. Your direct link is something to do about iMacs and doesn't mention MBPs. No clue why Apple did that.

Originally Posted By: Apple
MacBook Pro EFI Firmware Update 1.7 addresses an issue reported by a small number of customers using drives based on the SATA 3Gbps specification with the June 2009 MacBook Pro. While this update allows drives to use transfer rates greater than 1.5Gbps, Apple has not qualified or offered these drives for Mac notebooks and their use is unsupported.

3Gbps isn't officially supported? Are the drives that come with the MBP SATA-I drives?