PM8500 and Mac OS 9.2

I think I have it sorted...for some reason if I dragged both monitors on top of one another the display would shrink with a inch thick border around the desktop image. I think this was because the PCI card can to 800x600 and above and the onboard was saying it couldn't. I messed around with it and ended up with the Mac to vga adaptor plugged in to the Mac, while the monitor was hooked up to the PCI video card. Suddenly the on board video now lists more resolution the before.