Hi Ribis,
C2 doesn't need a whole lot of processing power to use effectively, so you shouldn't worry about that. Those that will really push the computer to its limits are 3D and video editing softwares when it does its rendering. Photoshop and other graphics software depends more on the graphic cards and RAM than processor power. And only certain software will actually utilize the amount of cores a computer has, so check to see if the softwares you are planning to use takes advantage of it. If not, RAM and graphic cards might be higher on your priority list.
Haha like katzin says, it will be good to test your game on an older computer or older phone depending on what you are targeting. I use my old xperia neo to test out my games as well. If they perform badly, I know I need to change things.
Hopefully this was of some help to you.