if it is not on the ASUS CPU support list then it is probably not supported AT THIS TIME. usually ASUS is very up-to-date on their support list. if you want contact ASUS support. they are up to answering questions like that. if you get lucky they might even release a BIOS update to support the CPU. i am not to savy on the AMD processors so i have to use Intels equivalent for the following example.
my 7 year old motherboard had a max Front Side Bus speed of 800MHz and could only support 90NM dual/single core CPUs (pentium 4/D and Celeron D) and 65NM single core CPUs. (newer P4s and Celeron Ds) then i wanted to upgrade to a older Core 2 Duo with 800MHz FSB, but i couldn't because they were all 65NM dual cores or 45NM dual cores. my motherboard can't support that because of it's hardware so a BIOS software update can't help. a similar problem might exist with that CPU such as the FSB being too fast. but like i said, i have only mastered Intels side of the CPU list.
just contact ASUS about your concern. like i said, they are more than willing to help satisfy their customers. that's why i love ASUS.