http://wiki.totalwar.com/w/System_Requirements_(TWR2)
Recommended
OS: Windows 7 / Windows 8
Processor: 2nd Generation Intel Core i5 (or greater)
Memory: 4 GB RAM
Graphics: 1024 MB DirectX 11 compatible card
DirectX®: 11
Hard Drive: 35 GB HD space
Screen Resolution: 1920 x 1080
So faster RAM should be better for that game. Just don't expect any miracles, +couple of FPS if any.