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Old 03-11-2018, 02:41 PM
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You could also check the power on the fan connectors with a multi-meter; it'd be easier than a SATA connector. Pin 1 is +12V, pin 2 is ground. (Pin 3 is tach, Pin 4 is PWM ... to complete the list.) As it's a PWM controller, is should provide +12V at all times.

Regardless, I'd still test the connector.

If you are getting +7V, rather than +12V, I'd lean towards the cable rather than the PSU. As I mentioned, crossing the one of the ground with the +5V rail will give you +7V on the +12V rail. There's plenty of stuff on the web that shows how to do this as a means of slowing down fans.
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