Hi federacer,
I'm sorry for bringing you inconvenience and the late reply. The situation you encountered is unusual. My OS is same as yours but the RAM consumption is much lower, so I think it may be related to some other usage environment.
Could you please help create full dump and send back to us for reference? It will help us identify the cause and which part and which process it is that eats RAM.
Attached is a tool to create full dump, and an animation picture to show how to use this software to create full dump. (The software, procexp, is a tool developed by Microsoft. It's safe and light, only 2.7MB. You can click it to use without installation.)
Any other question, please feel free to let us know.
Regards!
Jelly
procexp.exe