There has been a Bios update issued that will correct this issue with the Asus P6T-DLX. The bios update can be downloaded here: https://www.bigfootnetworks.com/support/index.php?_m=downloads&_a=viewdownload&downloaditemid=77&nav=0,13,14
Please refer to ASUS or Alienware for proper procedures for updating your motherboard's BIOS.