there are alot of other chips that need to be covered aswell
and they need alot of airflow so i would say nothing less then an 80mm fan blowing directly at the pwm area+plus some of these http://www.petrastechshop.com/enmomohekit.html
and they need alot of airflow so i would say nothing less then an 80mm fan blowing directly at the pwm area+plus some of these http://www.petrastechshop.com/enmomohekit.html