@itsfoss
Yup. I have 16 GB, and one day I checked, after a couple of hours of use, my system was up to using a whopping 2 GB of RAM.
Oh, but those remaining 14 GB is used for disk cache, right? Nope, that's 14 GB free memory, with an additional 1.4 GB (out of the 2 GB) used for disk cache.
Meaning the running system was using something like 600 MB, including userspace, kernel, X, video ram (my system has shared video memory).