[quote name='jkam'][quote name='vherub']don't disable onboard video, xp doesn't commit resources to onboard video when you have a video card, so any performance gains are negligible.
If you are even able to disable onboard video, it could create a hassle down the road if you need to pull your video card for any reason since you wouldn't have any video at all.[/quote]Ok good to know...thanks.[/quote]
Windows will still use resources to at least recognize the onboard video card after you'd install the other card and you'd be running two cards according to the Windows device manager.
Also, onboard video uses memory from your system; a separate card has its own memory. You're not going to get a "speed increase" from having more memory available to you but it will be useful to memory-intensive tasks for preventing sluggishness and program crashes.
Your motherboard's BIOS should have an option to disable onboard video; if you're going to look into that then you'd have to find a manual for your motherboard.
I'm not stating that leaving onboard video on will give you problems but I'm posting this so you'll have a better idea of things.