Would it be possible link control of a third party fan to the IOH diode reading, as this is on the Northbridge chip? Would it be possible to get a 7th fan on the application, and how could this be done? I suppose this might entail some custom hardware using one of the PCIe slots, but perhaps this could be achieved through a USB port. It must be possible to attach a third-party fan to the Northbridge heatsink. A larger heat-sink will not fit, as it is partly positioned under one of the main CPU heat-sinks. Furthermore, it is unnecessary only one chip overheats. Since my tower is on a desk one meter from where I sit this noise level is unacceptable. Incidentally, one hour of exposure to 80 dB is associated with permanent hearing damage. I measure 60 to 70 dB at one meter from the tower before it ramps up, and above 80 dB at load.
This overkill solution takes more power than necessary and is noisy. This works but causes these large fans to run hard, keeping everything cool. Macs Fan Control makes it possible to keep the Northbridge cool by linking the Intake and Exhaust fans to ambient temperature and setting the maximum at 40 degrees Centigrade. However, the Northbridge still gets hot quickly, and races up to 80 degrees Centigrade and higher when the system is under load. Every Mac Pro 4,1 and 5,1 owner should do this. This design fault (from the point of view of the user) can be repaired by replacing the clips with suitable metal bolts fitted with spring-loader washers. The plastic clips holding the heat-sink in place are prone to deteriorate (lifetime of about 5 years) resulting in separation of the heat-sink, rapid overheating of the Northbridge chip and failure. Failure of this chip is responsible for many, if not most, main board failures. Overheating of the Northbridge chip on the Mac Pro 5,1 is an endemic problem in these machines.
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