Bought for my cool i5 3570 processor with heatsink Prolimatech Samuel 17. The pair of them is really effective because the fan to start the pc is not running and in session games he has 850 turns maximum rev / min. I settled into my bios pwm for the fan that triggers from 35 ° C and not exceed 70 ° c I am max 63 ° C. I tested by forcing a 1200Tr / min and I heard no more. High fan very quiet range with high pressure ideal for ventilated my CPU while silence. Sold with all the connectors as possible and in a box that we will wish to keep. It was worth the money.