I found a tech post that says 24Gb is the minimum recommended RAM for using the Titan X.

http://forums.evga.com/System-Requir...2.aspx#2310149
https://forums.geforce.com/default/t...-requirements/

I was at Cyberpowerpc and selected a system with 16GB RAM and they mentioned nothing about it. I also took the printout to a local computer store and they mentioned nothing about it. Maybe the minimum RAM requirement is not a big deal.