My Motherboard is the same that yours (ASUS A7N266-VM). That Motherboard can support Processors with 333 MHz Bus but you must do psychal modifications to it... Look at
this Thread' ">http://forums.amd.com/index.php?showtopic=20482 maybe you can do it and will be happy with it. -Milt- should be able to assesorate in this better that I do.