I give 4 out of 5 stars for 2 reasons. First, the wiring was in the wrong position and upside down. I had to re-tap and flip the wires to get the power connector in the right position. Second, the left fan makes a slight hum/noise when spinning above 5200 RPM. They work great. My original fans in my 2012 MBP needed to be replaced and apart from the above this was a good decision. Complaints.
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