Use both fans who are not heard in desktop mode. Are connected to my manual fan control, but I never have to screw up because the fan along with the grandiose cooler in the minimum operating my i5 CPU to good values (far from maximum values!) Holds. Rarely had such a good cooler, always used Alpenföhn (eg lump), but here is the best for years, especially since he is not so high and therefore, despite large side fan still fits into my phantom housing. Optimal! Only in my RAM now I'm not, but without defect, I do not want that anyway;)