In order to run Far Cry: Primal, your PC MUST meet or exceed the minimum system requirements:

Minimum System Requirements

Supported OS: Windows 7, Windows 8.1, Windows 10 (64-bit versions only)
Processor: Intel Core i3-550 @ 3.2 GHz or AMD Phenom II X4 955 @ 3.2 GHz
VIDEO CARD: NVIDIA GeForce GTX 460 (1GB VRAM) or AMD Radeon HD 5770 (1GB VRAM) or equivalent 
RAM: 4 GB
Hard Drive Space: 20 GB
Peripherals: Windows-compatible keyboard, mouse, headset

Recommended System Requirements

Supported OS: Windows 7, Windows 8.1, Windows 10 (64-bit versions only)
Processor: Intel Core i7-2600K @ 3.4 GHz or AMD FX-8350 @ 4.0 GHz
Video Card: NVIDIA GeForce GTX 780 | AMD Radeon R9 280X or equivalent
RAM: 8 GB
Hard Drive Space: 20 GB
Peripherals: Windows-compatible keyboard, mouse, headset

Supported Video Cards at Time of Release: 
AMD Radeon™ HD 5770 (1 GB VRAM) or better, HD 7000 / 200  / 300 / Fury X series, 
NVIDIA® GeForce® GTX 460 (1 GB VRAM) or better, GTX 500 / 600 / 700 / 900 / TITAN series

Note:  Laptop versions of these cards may work but are NOT officially supported.

Latest GeForce drivers tested: Nvidia GeForce 358.91 WHQL
Latest Radeon drivers tested: AMD Catalyst 14.4 WHQL

Supported gamepads:  

Microsoft Xbox One Controller
DUALSHOCK® 4 Controller
XInput gamepads

Supported DirectInput gamepads:

Thrustmaster Dual Trigger 3-in-1 V.2
Thrustmaster Firestorm Dual Analog 3 Gamepad
Thrustmaster Dual Analog 4 v.1
Thrustmaster Firestorm Dual Power 3 Gamepad
Thrustmaster T-Mini 2-in-1 Rumble Force
Logitech Rumble Gamepad F510
Logitech Wireless Gamepad F710
Logitech Dual Action
Saitek P880 Dual Analog
Acme GA-02 USB
SPEEDLINK STRIKE SL-6535-SBK-01
SPEEDLINK Torid Gamepad Wireless