That'd be optimal. But you don't want 3 intakes and one outtake. They need to be pretty balanced. In my case, I have a 120mm fan in the front, 120mm in the back, and 80mm in the side. Then all the internal fans. I'd like to have a little more outtake really but my case won't allow it. Oh, and I forgot, my PSU serves as an outtake as well right above the CPU.