I'm on the verge of putting together a new system, and while in the short term I'm not going to be using crossfire, I may upgrade to it within a few months pending how happy I am with the system's performance. From what I understand, there is a performance hit for crossfire on a P45 board compared to an X48 one. I'm wondering if I should eat the small(?) extra cost to get an X48, or just get a P45 because of other advantages or because the crossfire performance hit too small to really worry about.