yes but not using a 915 chipset. Its the same procedure anyway. First create your raid aray, this is done by using the raid tool on your Motherboard. The two HD's should really be the same size and brand and you will also lose all data currently on the drive. The will now become "one" drive. If you use 2x120GB it will become a single 240GB etc..

Make the raid array and set it to raid 0, restart your pc with your vista disk and when it loads up it wont detect your drives. Dont panic this is normal! You select the option to load a 3rd party driver and browse to the driver for your raid motherboard. This will be on your motherboard CD, once you do this install as normal.