Here are the No Plan B System Requirements (Minimum)
CPU: Info
CPU SPEED: 2.2 GHz Dual core
RAM: 2 GB
VIDEO CARD: NVIDIA GeForce GTX 550+, Radeon HD 5900+, or Intel HD 4000+
PIXEL SHADER: 5.0
VERTEX SHADER: 5.0
OS: Windows 7 SP1+
FREE DISK SPACE: 1 GB