You cannot use the original driver, because the X79 HardwareIDs are missing within the INF file, but you may try the Intel RST driver v11.2.01006, which I have modified to make it compatible with X79 chipsets. You can get it from >here<. I am not sure, that Intel will release any new RST/RST(e) drivers, which will be officially designed for being used with Windows XP (32/64bit). As long as you will use any of Intel's RSTe drivers, you will see your drives as SCSI disks. That is a feature (to get the TRIM command into a RAID array) and not an issue. There is no and there will never be any generic MS AHCI driver for Windows XP (32/64bit). Thanks Fernando for clearing up some of my confusion... I'll try out your modified_v.11.2.0.1006 RST Driver tonight and let you know how it goes. I do hope Intel will release an 11.6.x RST driver that works for XP64-- do you know who I can bribe/pay to make sure they cover XP64? The main reason I installed this older OS is because it supports 3D hardware acceleration for 32-bit apps... whereas the Win7 64-bit "XP Mode" does not-- only software rendering via the CPU. Thanks for making the modified driver... just PM me where you'd like me to send you a case of your favorite beverage