Yes that's the main reason + the fact that nowadays drives are bigger but less safe than some years ago + the fact that it's harder to solve some problems if the drives are on a RAID 0. The safe rule is "you should never install your operating system on a RAID 0 array". As TheMatt said, RAID 1 is the best option.
As I already said, a RAID array won't speed up your in-game performances except maybe for some rare games where there are no loading screens and the areas are all "streamed". Even there, it won't add to the framerate but only prevent it from dropping a bit by loading the following area faster.
Your motherbard has 2 different HDD controllers. If you want to setup a RAID array, don't forget to set your 2 identical drives on the same controller. Here are your complete motherboard's specs :
http://www.asus.com/products.aspx?l1...32&modelmenu=2