From my experience the RAID chips on Asus are horrible.. the one my A7N8X had required drivers, and it turns out everthing runs software. you'd be better off using MD with or w/o LVM on Linux.. dont know about software RAID on Windows though if that's what you run. I can't remember the OEM of the chip but I could find out. it was a pain.. MD has been beautiful, though!

I've got mythtv, news servers and web servers running off of MD RAID. it's sweet when you drop LVM into the mix- you can manipulate volumes as needbe.