Hi Summit48 and thanks for your reply…
MacBook Pro 15" Late 2011
SSD: Sandisk Extreme Pro 480GB (Sata III)
Firmware version: X21100RL
OS X Mavericks 10.9.5
Bootcamp version: 5.1
Windows OS version: Micrsoft Windows 7 Professional 64bit (SP1)
600MB/s under OS X Mavericks
300MB/s under Bootcamp
P.S. I read AHCI is disabled by Bootcamp so SATA speed are reduced till you tweak something…?