I am now using XP Pro x64 with AHCI mode on SB750, however i integrated 3.1.1540.61 and 3.3.1540.13 with nLite in order to install correctly.
After booting, running all updates, installing my progs, etc., i manually installed amd_sata.sys version 1.2.001.321 for XP64 from Update Driver>No, not this time>Install from a list or specific location (Advanced)>Don't search. I will choose the driver to install.
I had the driver pack 12-3_xp32-64_sb.exe extracted and navigated to the SB7xx driver folder.
It may not be loaded initially, but if the driver version is the same after reboot, one can go to the same list and select the "AMD SATA" entry, after the first "AMD AHCI RAID Compatible Controller"entry available.
Performance numbers are much better with my Crucial M4 SSD and i'm really glad i tried updating. I also have a ss with AS-SSD benchmark and Driver Info Tab showing 126.96.36.1996, but i can't remember where i found it,nor can i find it again in my storage disk...
You can see my results here : 188.8.131.521