How much memory (Ram + video mem) can i access under Windows 64bit?

I am about to install a 64-bit windows on my computer:

4GB RAM
2GB onboard memory on the video card

Am I correct in thinking that with 4GB RAM and 2 GB on the Video card, under windows 32 bit it would only take a 'total' of 4gb into account?
(2 Gb kernel usage, 2 Gb application usage)
and under windows 64 bit it would take both the full 4GB RAM and the full 2GB onboard mem of the video card into account?
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More about memory video access windows 64bit
  1. The theoretical limit for 64 bit operating systems is 16 Exabytes.

    The 'practical' limit, as artificially set by Microsoft, is 64GB (Basic x64) and 128GB (Premium/Business/Ultimate).

    Your hardware and applications will be able to use all the resource they're programmed to.
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