• AddressOf.com : Windows Vista "supports" 4GB of memory. Sure it does...
  Here's the problem; what if you have a video card that has 512MB, 640MB, 768MB? Yup, that will be mapped to the 4GB of addressable space. So if you had a 768MB NVidia 8800 card and 4GB of RAM, you'd lose 768MB of that 4GB of memory immediately to the device making it non-accessible "memory" for the OS.
  Grrrr... this one I didn't really see coming. I figured, "Hey, I'm running Windows Vista Ultimate; which loves memory... I'll get more memory and it'll be happier." So I ordered 4 1GB high performance RAM (which using the motherboard
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