You can promote it with ModePro. The preview, are you talking the render screen or the "make preview" option? You can render the display to CyberGraphx with the CyberGraphx render display add on. The make preview will only work on the native chipset.
This thread has info on setting up Lightwave on Amithlon, just follow for the render display options...
http://eab.abime.net/showpost.php?p=...postcount=1042