In 99% of all flat games more than 16GB Ram are not necessary, but what about vorpx ? The images are calculated two times, each for one eye. Does vorpx use extra Ram for this task ?
Pretty much what Jey123456 says with one exception: in games with DirectVR memory scanner support vorpX temporarily may require significantly more system RAM during a scanner run. How much depends on how much of a game’s RAM has to be scanned.
Unless you have an awful lot of stuff running in the background that consumes huge amounts of RAM, 16GB will still suffice under all circumstances.