RTS games do like a powerful CPU. But most can get by on a dual core just fine.http://www.gamespot.com/features/6166198/p-6.html
Thats a decent review. It looks like a quad gave it a 40% boost over a dual core at the time.
So its possible that Thuban will give you 40% more, but thats if it can use more than 4 cores.