System Management Unit
The System Management Unit (SMU) is an advanced internal subsystem introduced in late 2004 with the iMac G5 and Power Mac G5 series computers. It manages the functions previously governed by the PMU (Power Management Unit) as well as additional cooling functions.
Overview
The SMU manages thermal and power conditions to optimize the power and airflow while keeping audible noise to a minimum. Power consumption and temperature are monitored by the operating system, which communicates the necessary adjustments back to the SMU. The SMU makes the changes, slowing down or speeding up fans as necessary.
Resetting the SMU may fix certain problems during troubleshooting.
gollark: What's the advantage of this?
gollark: What's the point of keeping time so weirdly?
gollark: Oh, you're just suggesting a weird time system for Mars? Why?
gollark: I'm not really sure what you're suggesting, but measuring things wrong doesn't change what the speed of light is.
gollark: https://en.wikipedia.org/wiki/Landauer%27s_principle
See also
- Power Management Unit (PMU)
- System Management Controller (SMC)
References
- Owen W. Linzmayer (ed.). Desktop and Portable Systems: Second Edition. ISBN 0-321-33546-5.
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