Moldboys response seemed a little... "Back From The Future" so I thought I would update it a little.
If your computer was purchased within the last EIGHTish years you have PCI slots guaranteed ( obviously not on laptops ), and more than enough of them ( probably ).
If youre computer is about fiveish years old, you almost definetly have an AGP slot.
If your motherboard is maybe a year old you
might have a PCI-Ex x8 or x16 slot, and if so, you WONT have an AGP slot ( they serve the same purpose ).
95% of the time you can disable onboard video in the BIOS ( only do this with another video card installed and being used, otherwise youll have to reset the CMOS to regain video ).
Assuming you have a EISA/PCI/AGP/PCI-Ex slot, you can ALWAYS add a video card and use that instead of the onboard ( integrated ) video.
Onboard video ALWAYS blows goats. A PCI video card will always beat onboard PCI video and often beat onboard AGP video ( unless the onboard AGP is of higher quality compared to other integrated AGP video chips ).
ALL integrated video also consumes your RAM ( some more than others ). This is part of the reason that youll almost always see improvement using a video expansion card.
I hope this is helpful.
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