I just finished tests with Modbin's patched PXHCD in the LaCie kext. I am using a CalDigit USB3 card.
The key ( as stated by dasdasein... Thank You!) was to rebuild the cache using pfix v 3.1 after repairing permissions.
All tests were done with a Seagate ST3500630AS 1.5TB drive using AJA System Test
SATA tests were done with the drive connected to motherboard SATA
USB2 tests were done with the drive connected to motherboard USB2
FW400 tests were done with the drive connected to motherboard FW400
USB3 tests were done with the drive connected to CalDigit card
The USB2 and FW400 external drive case is a MacAlly G-S350SUA
The USB3 external drive case is a MacAlly NSA-S350U3
USB3 wins by a large margin! (I will have to move some things around to test FW800, but I will post that when I can)
USB3 121.7 MB/s Write 127.6 MB/s Read
SATA 65.8 MB/s Write 68.9 MB/s Read
FW400 30.4 MB/s Write 39.8 MB/s Read
USB2 31.8 MB/s Write 37.2 MB/s Read
Special Thanks to Modbin, Cartri, and stellarola ( for getting me into hackintosh's )