Hopefully you know about that baseline setting.

Your best solution is to first make sure that the fans in BIOS are set to run as slowly as BIOS will let them. Then the HP motherboard detects impending disaster and ramps everything up. So, when the standard HP PWM braking is auto-applied to a Noctua PWM fan it changes from running slow and quiet to running way too slow. The HP fans are specifically selected to run quite fast if no PWM braking is applied to them. If it sees a high wattage processor without a 'Performance' fan at the heatsink it will complain or halt boot.Īnother example: The nice Noctua PWM fans have the standard 4 fan wires and are built to run slow and quiet with no PWM braking applied. That is how the motherboard knows a proper 'Performance' HP fan is present. there are the 4 standard PWM fan wires from/to the fan, plus a ground jumper from pin 1 to 5 added to the fan's plug end. The HP heatsink/fan combo for certain higher wattage processors requires a special fan that has 5 rather than 4 connections to the motherboard header. Pulling out all the HP fans and putting in others is generally a bad idea. The HP workstation motherboard system of maintaining balanced cooling (and a safe level of cooling) is complex and tightly engineered. Business PCs, Workstations and Point of Sale Systems.

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