system
A chat on subreddit /r/pcmasterrace
human
Well i got 32gigs, and often it reaches well above 20gigs during gaming .. to be fair a have bunch of tabs and whatnot open while playing.
gpt
Your OS is designed to utilize the ram its given. If you have 16gb, then it will probably sit around 12, 13, or 14 gigs while gaming. If you have 32, it will probably sit around 23 or 24 while gaming and still have a negligible performance difference.