I have just got another 16gb, 32gb in total... The pc isnt doing much atm but over 4gb is in use, (browsing net, watching tv with usb stick and a family member is streaming vids from pc) Also its catching 14gb of mem for my most used apps and stuff, so actually windows is eating up 16+gb.
I bet the majority in the cache never gets used more than once.
Yours says 28gb available, you have a web browser open, dunno what browser you use but firefox easily uses around 700-900mb somehow for me, your watching tv on a fire stick and someone is streaming a movie so your running some form of streaming service on the pc.
without that you would probably be using less than 2.5gb actual ram that windows cant use for something else.
On my pc im using 2.2gb doing nothing which leaves plenty for games, could close some background programmes if I wanted to and be using less
out of all the games I played only GTA V maxed out at 1080 had a problem with 8gb of ram (windows pop up saying I was running out of memory) game still seemed fine. I just needed to up my paging file a bit and it was fine without stutters playing.
You can game with 8gb but anyone buying a pc/building should get 16gb
i5 4670k @ 4ghz
980ti which I've had since release day when they were something stupid like £800 ?
8gb ram
Could easily have afforded to upgrade to 16gb at some point if I felt I really needed too.
It's not like I close a game and have any big black screen before the desktop loads, it's still instant.
maybe SSD helps with that though