Running in AHCI mode can/will help with random read/write performance and therefore responsiveness. As EXT pointed out, Windows 7 includes the necessary drivers. However, to speed start up times Win 7 only loads the drivers it's told -
(by the Bios at install time) - are necessary. So, if you merely pop into the Bios and flip the AHCI switch to 'On', you'll get the "Windows Has Failed To Start" troubleshooting sequence instead of getting into your computer.
In technical circles, that's known as
"A Really Bad Thing", and we try very hard to make sure that never happens.
But we're smarter than that, and will make the proper registry entries in Windows before screwing with it... THEN shut down; pop into the Bios on the way back in to make the change; let Windows load; and - because we've made a fundamental alteration to the system - restart once Windows has completed it's work.
And because we here at Toms are smart, we also know very well that monkey~ing around with the Windows Registry has the potential to brick your OS. So we double check that we're making the proper entries; that we are making *only* the proper entries; and we are positive we're not touching anything else.
So - Yes, it is possible to enable AHCI after the fact... If you want to....
Warning:
BACK UP YO SHEEYAT!!!
THIS INVOLVES REGISTRY SETTINGS!!
THE ONLY ONE RESPONSIBLE IF YOU DO THIS IS YOU!
MAKE A SYSTEM RESTORE!!
IT'S THE RED PILL!!! OR WAS IT THE BLUE?? No... Wait....
oNE sIDE mAKES yOU bIG... thE oTHER sIDE... Aaaahhh... screw it: Here's the Tutorial.