My PC (Compaq Presario) has an onboard Intel 3100 which is pretty lame wbut would be useful for testing on, or a 3rd monitor. I've then got a nVidia PCIx card installed. I can't seem to find a way to turn both on at once... is it likely this is a BIOS limitation?
Running Windows 7.
The official page suggests I can't do this but I wondered if there is a way?
Answer
To flesh out Sathya's answer a bit: In most systems, the same PCIe lanes are used for both the IGP and the PCIe-x16 slot for the video card. So either the slot can be used or the IGP. This means you can't even put non-video card devices (e.g. RAID controllers) into the x16 slot without losing access to the IGP -- you'd still have to install a video card in a different slot!
Late Edit: It appears that on Sandy Bridge systems with an H67 (and probably Z68, when they launch) chipsets, it's possible to run both the onboard GPU and an add-on graphics card at the same time. Other 6-series (and later) chipsets may work as long as both the CPU & MB Chipset support Intel's Flexible Display Interface, a DisplayPort-based standard that gives the integrated GPU a direct connection to the onboard video connectors.
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