It's my first passive cooler, used to cool a I7-4790S with passive power supply and 1 fan Noctua 140mm rear next to the FX100, the processor remains in normal operation at about 35 ° C and rises up to about 55 ° C to 30 min OCCT. 1 star less because a thread was broken and I would have to mess around that the radiator is properly seated! (Did not like the whole pack again and send it back)