Not being a computer nerd AHCI is something I recently stumbled across after installing an SSD drive to replace my HDD.
AHCI is a newer and faster way of read/write than IDE.
By default win7 and vista use IDE mode because it always works with old components.
I was curious if my old rig would see an improvement if I activated AHCI mode.
Before I made the change I checked my windows performance score with the new SSD drive installed = 7.1
After the change to AHCI mode my windows performance score = 7.4
Windows calculates the score from the weakest component. Previously my weakest component was disk data transfer rate = 7.1 that gave me the low score.
After AHCI my disk data transfer rate has climbed from 7.1 to 7.6.
Now the weakest component is my CPU = 7.4 giving me the overall score.
So for me it is an improvement in overall score. The game loads faster although I doubt it will affect frame rate in GPL which is down to my CPU.
AMD Phenom x4 965 BE @ 3.8ghz
Gigabyte ga-ma790xt-ud4p mobo
Corsair 16gb DDR3 1600 ram
Nvidia GTX 1050ti
Samsung 870 SSD