Call of Duty website now offers system specifications for Call of Duty: Ghosts, revealing the PC edition has a surprisingly steep 6MB RAM minimum requirement (thanks DSOGaming). Here are the specs:

Minimum System Requirements:

OS: Windows 7 64-Bit / Windows 8 64-Bit
CPU: Intel® Core™ 2 Duo E8200 2.66 GHZ / AMD Phenom™ X3 8750 2.4 GHZ or better
Memory: 6 GB RAM
Hard Disk Space: 40 GB
Video: NVIDIA® GeForce® GTS 450 / ATI® Radeon™ HD 5870 or better
Sound: DirectX compatible sound card
DirectX®: DirectX® 11
Internet: Broadband Internet connection for Steam and Online Multiplayer.