There are machines with (say) 16 gigabytes of RAM, where Task Manager shows 97% or more memory in use, but the numbers don’t add up even close to 16G. The first step is to get RAMMap:
learn.microsoft.com/en-us/sysinternals/downloads/rammap
and study the Use Counts tab list. There may be more than one cause, but the one I’m looking at, shows most of my RAM used by “Driver Locked”. Microsoft says updated drivers will fix it. Will continue this article when I have data. Current references:
learn.microsoft.com/en-us/answers/questions/128755/driver-locked
learn.microsoft.com/en-us/windows-hardware/test/assessments/windows-assessment-console
learn.microsoft.com/en-us/windows-hardware/get-started/adk-install