If you have an option in your BIOS entitled "Slot Power" - try setting is to [HEAVY]
also, check with either ASUS or Intel for any chipset updates for that mobo
*Edit> I just thought of this, too - what interface is your card, AGP or PCIE? Also, what CAT version are you using? If you're running 7.11, try completely removing that version and install 7.10 or 7.9
If you're running an AGP card, try installing 7.8 instead.