Here are the World War Z System Requirements (Minimum)
CPU: Core i3-3220/AMD A10-5700
CPU SPEED: Info
RAM: 8 GB
VIDEO CARD: GF650Ti/ Intel 630/ Radeon HD 5870
PIXEL SHADER: 5.0
VERTEX SHADER: 5.0
OS: Windows 7 and later
FREE DISK SPACE: 35 GB

World War Z Recommended Requirements
CPU: Intel Core i7-3970 @ 3.50GHz
CPU SPEED: Info
RAM: 16 GB
VIDEO CARD: GeForce GTX 960 / Radeon R9 280
DEDICATED VIDEO RAM: 2048 MB
PIXEL SHADER: 5.1
VERTEX SHADER: 5.1
OS: 64 bit Windows 10
FREE DISK SPACE: 35 GB