Creative Assembly has released the minimum and recommended specs for Total War: Rome II. It's a big game that'll certainly need some power under the hood if it's going to be run with all the settings maxed. Check the specs out for yourself, and then start working out if you need to start saving up for an upgrade before the game launches on September 3.
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
We got hands-on with the game recently, and you can read about our experience right here. You can also view a huge panoramic screenshot from the Battle of the Nile here.