Look where your monitor is hooked up to your machine, if it's on a vertical line with other connectors then you have onboard video, if it plugs into a horizontal connector then that's where your video card is. I have two video cards. Yours will not be so thick though as mine take up two slots each.
Everything that irritates us about others can lead us to an understanding of ourselves. -- Carl Jung
eVGA X58 tri-SLI, i7 930 @ 3.8GHz., Corsair 6GB Dominator, Inno3D GTX470, eVGA260
ASUS P8P67 Pro, i7 2600K @4.60 GHz, 8GB RAM, eVGA GTX 460