It will support Windows XP, and need at least a 2.6GHz single core processor. It will also take up 35 GB of HDD space, or SSD if you’re fancy. All in all they’re reasonable.
As an extra treat Creative have also published some more of their giant sweeping panoramas for Rome II which can be enjoyed over on the official Total War Wiki.
Minimum:
◦ OS: XP/ Vista / Windows 7 / Windows 8
◦ Processor:2 GHz Intel Dual Core processor / 2.6 GHz Intel Single Core processor
◦ Memory: 2GB RAM
◦ Graphics:512 MB DirectX 9.0c compatible card (shader model 3, vertex texture fetch support).
◦ DirectX®:9.0c
◦ Hard Drive: 35 GB HD space
◦ Screen Resolution: 1024x768
Recommended:
◦ OS: Windows 7 / Windows 8
◦ Processor:2nd Generation Intel Core i5 processor (or greater)
◦ Memory: 4GB RAM
◦ Graphics:1024 MB DirectX 11 compatible graphics card.
◦ DirectX®:11
◦ Hard Drive:35 GB HD space
◦ Screen Resolution: 1920x1080
Total War: Rome II releases on PC September 3rd.