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#11
That is not the case. Unless the video card has no dedicated VRAM (and hence uses RAM), it does not occupy any physical RAM, but virtual address space in the lower 4GB of virtual address space - the address range is invariant for historical and compatibility reasons. This is virtual address space RAM cannot use. In 32 bit windows, there is nothing you can do about it and the RAM in that address range cannot be used. In 64 bit windows, the RAM in this range can be remapped to a higher virtual addresses enabling the full amount of RAM to be used.