If i'm not mistaken my video cards have their bios run before the system goes through post ( that way you can actually see things) but if it's on board that may not happen, so the safest bet would be Right click on the Desktop -> go to Properties -> Click on the Settings tab -> click on Advanced -> click on the Adapter tab and it should tell you there, if not let us know....
BTW another way would be to Right Click ont My Computer -> Go to Properties -> Click on the Hardware tab-> and depending on your OS find the button/tab that says device manager It should be there too. Hope this helps
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Danrak beat me