It's ok, even the official drivers released a couple of days ago have no support for the Frame Buffer extension. It will take sometime before a public release officially supports them. The bit of good news is, this extension is likely to be available on a large selection of hardware ( read all the way back to the Geforce 256).
Wow - thats great! I have a GF488Go in my laptop and you know, changing graphic bard isn't that easy with notebooks ;-)