is that the official Apple GF4MX? Certainly the GF2MX cards are not dual head and will only mirror output, I suspect the GF4 might be the same, especially under OS 9 as the drivers weren't great for these cards. Same goes with wanting 1080p and 720 WS resolutions - you'd be pushing it.

Click to expand...

Hmmmm. There is a utility out there written by a fellow in .de (Deutschland?) which enables display spanning on iBooks and iMacs and at least some of those iMacs have the GF4MX chip. So it is conceivable that said utility would enable spanning using the GF4MX AGP card.

I think I find the link, when I want it by going to the everymac.com listing for the 17" 800MHz G4 iMac (boots OS 9 version), scrolling down the the section on video, and there's a little note about mirroring only and a link to the utility for those who want to enable spanning.

Can't remember if the utility is OSX only or also has a version for 9.x.