Windows XP: I have an on-board graphics card that has 2 outputs (VGA and HDMI) (Intel motherboard).
In addition I have an external graphics card with VGA and DVI (nVidia).
Can I use 3 or 4 of them at the same time?
Windows XP: I have an on-board graphics card that has 2 outputs (VGA and HDMI) (Intel motherboard).
In addition I have an external graphics card with VGA and DVI (nVidia).
Can I use 3 or 4 of them at the same time?
You almost certainly cannot. Video hardware is more than just an outlet socket, it needs RAM, DMA or bridge and controller circuitry. In nearly every case, a card or motherboard has one set of circuits that can drive one monitor, but has both a DVI and VGA connector so you can connect either one DVI, DMA, or whatever monitor. Trying to plug multiple monitors into the same circuit would show identical images at best, but will probably not have enough signal to drive two monitors and will not work at all.
You may be able to run a monitor from the on-board integrated graphics and another, separate, video card if the separate card does not make use of any of the on-board graphics circuitry. Many cheap video cards do. In that case, you will only be able to use the (presumably better) card video.
Yes, you can use 1,2,3, or 4 at the same time. Windows 7 might not like having two different drivers for video cards, but that should not be an issue with xp.
With Dell desktop machines, I've been able to use the onboard vga with a PCI FX5200 card for 2 to 3 monitors without problem. Your motherboard may not support this feature, so it's something to check on for your motherboard.
For people that want to hook up more than two monitors, try downloading the AMD software — it works fine on NVIDIA cards. Normally you can't hook up more than two monitors on an NVIDIA card, but the AMD software allows it.
Here is my setup: