First impressions of the A7M266 can be found on this home page. Although the text is in Japanese, it is mostly filled with pictures. Benchmark comparisons using a TBird 1GHz on the Iwill KA266-R and Gigabyte GA-7DXC can be found on the next page. Both implemenations of the AMD 760 beat the ALi MAGiK 1 at 200MHz DDR FSB.
Another user has posted his comments on this page. While the manual clearly says that the user can change the clock speed multiplier within the BIOS, as you can see from the BIOS screenshots, the CPU Clock Multiplier entry has been grayed out. This effectively means that the clock speed multiplier CANNOT be changed either through the BIOS or via onboard DIP switches at least until another BIOS revision (the 1002 final BIOS can be found here). The FSB speeds can be changed in 1MHz increments through the BIOS. This user also reports that mixing two different brands of memory (in this case Micron and Apacer) resulted in BSODs and instability in both Win2k and WinMe. Without further tweaking and refinement, Asus' first date with the AMD 760 looks to be somewhat disappointing.