A:Answer The minimum requirements to the Sims 4 seem to be around that of World of Warcraft, I juiced my laptop to 4GB of memory, but also tested WoW before the upgrade.
4GB test: Settings on medium-low = 50 FPS in expansion city.
8GB test: Settings on medium-low = 53-65 FPS in expansion city.
A lot of people would say that 20-30 FPS is more than enough to play any game. I would say given my tests and results that the Sims 4 should be on medium-low settings just fine.