I have the 2.4 GHz 2GB DDR2 White MacBook. I recently noticed (and some of my friends made fun of this) that I have Inter GMA X3100 Graphics card, but that's not all. I got VRAM (Total): 144 MB, which is abnormal (that's the first time I experience it, and all of my friends were shocked). Also, when I play COD4, guns, cars, sometimes get black, and then come back to half-normal. I get black guns when I'm under shadow.
Let me just skip to the question: Is there a way to upgrade Graphics/Video card to nVidia or maybe something better on MacBook
? I don't feel like buying new Mac 
Let me just skip to the question: Is there a way to upgrade Graphics/Video card to nVidia or maybe something better on MacBook