Windows being a VM OS will cache everything. Even trivial things so memory in use under the best condition should soar to as close to 100% as possible. Your gadget may not show this caching since it's not a process.
Hello so I have 16gb of RAM, and for some reason task manager is showing that 80% of my RAM is currently in use. I literally added up all the processes, and only about 2gb of RAM was in use. My CPU usage gadget shows that 13gb is in use. Currently I have one window of Chrome up. I have never seen this issue, if anyone could assist me I would be very greatful.