I was hoping to add a PCIe x16 video card to an Optiplex 390 and still use the on-board graphics. I've added a card and it seems to have disabled the on-board graphics. Is there something I need to change, or is this the way it is? 

I assume I can go and add another PCIe x1 card?

The card I added is an ATI FirePro 2450 Quad Output card. I need to drive 5 monitors. 

Any ideas would be great.