Call of Duty has revealed the official PC system requirements for Modern Warfare 3. Here are the specifications needed to play Call of Duty Modern Warfare 3:

Minimum

OS: Windows 10 64 Bit (latest update)  
CPU: Intel Core i5-6600 or AMD Ryzen 5 1400  
RAM: 8 GB  
Hi-Rez Assets Cache: Up to 32 GB  
Video Card: NVIDIA GeForce GTX 960 / GTX 1650 or AMD Radeon RX 470  
Video Memory: 2 GB  
Storage: SSD with 149GB available space (78GB if COD HQ and Warzone are already installed)

Recommended

OS: Windows 10 64 Bit (latest update) or Windows 11 64 Bit (latest update)†  
CPU: Intel Core i7-6700K or AMD Ryzen 5 1600X  
RAM: 16 GB  
Hi-Rez Assets Cache: Up to 32 GB  
Video Card: NVIDIA GeForce GTX 1080Ti / RTX 3060 or AMD Radeon RX 6600XT  
Video Memory: 8 GB  
Storage: SSD with 149GB available space (78GB if COD HQ and Warzone are already installed)

Competitive / Ultra 4K Specifications

OS: Windows 10 64 Bit (latest update) or Windows 11 64 Bit (latest update)†  
CPU: Intel Core i7-8700K or AMD Ryzen 7 2700X  
RAM: 16 GB  
Hi-Rez Assets Cache: Up to 64 GB  
Video Card: NVIDIA GeForce RTX 3080 / RTX 4070 or AMD Radeon RX 6800XT  
Video Memory: 10 GB  
Storage: SSD with 149GB available space (78GB if COD HQ and Warzone are already installed)

Required for all specs:

Network: Broadband Internet connection  
Sound Card: DirectX compatible

Recommended Drivers for NVIDIA/AMD

NVIDIA: 537.58  
AMD: 23.11.1

Call of Duty: Modern Warfare III campaign early access begins November 2nd for all pre-purchases, with the full release following on November 10th.