Wanted to contriboot.
The stock fan is only good for sending small Craft into low earth orbit.
I'm using 3pin corsair sp120 running full speed off a molex to 6 x 3pin fan board for the push and an af120 @ full speed from the same board. I think the onboard pwm is shit
Now I live in Australia and it's summer so ambient temperature is around 30*c and often up to 40*c and my s5 is running at 55*c just slightly underclocked to keep it there.

Much happier with that.