Re: Options for adding a third monitor
I have since switched the ATI graphics card for an Nvidia one; a 6200 PCI, to complement my main 6600 PCI-X. OpenGL now works across all three screens, where it did not with the ATI card.
I had to give additional arguments to the kernel boot: vmalloc=256M. This is fully explained in the documentation from NVidia.
I also found I got a notable performance increase to web browsing in Opera by running the command: nvidia-settings -a InitialPixmapPlacement=2 -a GlyphCache=1