I bought a new computer recently. It has a Radeon HD 7470 card. I've noticed some seriously lag especially in battle when there are a bunch of ships on the screen. Before replacing my old computer, which died by the way, I bought a new video card for it; a GeForce GT 610. Should I put the GT 610 in the new computer or is the 7470 a better card? And if so what's with the lag?