Hi guys, in your opinion which kind of cfm di I need to mantain a r9 280x toxic + fx8350 + asrock extreme3 r2.0 build at a very good temperature condition? I have a corsair spec-03 case with 2 120mm fans, and can install up to 4 more (2x120 + 2x140). Any suggestion? And is cfm the only important indicator for cooling?