I tested Asus A7n266-VM in Mandrake9 .It is good for linux
( Built upon the advanced nForce chipset architecture, the A7N266-E features powerful GeForce2 level 3D graphics, Dolby digital 5.1 audio and integrated LAN for an all-in-one solution with unmatched performance and value.)
All thing work good.
I think nvida onboard (Graphic card, sound card ...)
working with linux.