Would anyone know if it would be possible to use x16 PEG card for driving two displays and at the same time use IGC from a chipset (e.g. 965 or GM45) for driving additional one or two displays?
I understand that theoretically it would be feasible but would like to know if in practice anybody is actually doing it.
It may depend on your OS. At one time with XP, I think, the OS was able to use only one graphics driver for all the active adapters. I think that has changed with windows 7. If so, you should be OK. If you already have two displays, why not try it?
As an alternative, you could get a cheap second video card that uses the same driver. For instance, the nvidia driver can run everything from a 6600 on up. I have a 3450 and a 5870 to drive two displays under windows-7. My rationale for doing so was to relieve the main graphics card to be able to deliver full gaming power to one monitor.
Even if you do not have a second pcie slot, there are cheap cards that can use a pci slot.