This report describes the instrumentation developed for the dynamic measurement of power and temperature for the Apple Power Mac G5. The G5 employs one or two 64-bit PowerPC 970 processors and runs Mac OS X, and 32-bit or 64-bit Linux. Apple has implemented a set of temperature, power and fan RPM sensors. OS X uses the sensors for fan speed control, in order to minimize the acoustic disturbance of a deskside system. The following metrics are obtained.
• Fans rpm
• Fans outlet temperatures
• Voltage to each 970 processor
• Current to each 970 processor
• Temperature of each 970 processor
Note: This report describes the first revision of the dual-processor 2.0 GHz Power Mac G5. By the time you read this, a newer liquid-cooled dual-processor 2.5 GHz model will be available.
By: Wes Felter, Tom Keller
Published in: RC23276 in 2004
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