Call of Duty: Warzone System Requirements
Minimum
Recommended
CPU
Intel Core i3-4340 or AMD FX-6300
Intel Core i5-2500K or AMD Ryzen R5 1600X
RAM
8GB
12GB
HDD
175GB HD space
175GB HD space
Modern Warfare is typically the free version which has a huge map. I wouldn't worry about it personally. That game is a resource hog and RAM usage probably goes up and down quite often. I still use 16g and have no problems running it.