Blind-Goose, you are correct. The third patch on the fan is for RPM monitoring, it just isnt used when sold as a 4-pin molex fan, beacuse there's no use for it. If you can manage to solder a wire to that, and lead it to the rpm monitoring line on your motherboard or digidoc, it should work like any other 3-pin fan
-FoolOnTheHill
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