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System Management Unit
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<p>The System Management Unit (SMU) is an advanced internal subsystem introduced in late 2004 with the <a href="/facts/IMac_G5/clx0EPQE">iMac G5</a> and <a href="/facts/Power_Mac_G5/DfREoJlg">Power Mac G5</a> series computers. It manages the functions previously governed by the <a href="/facts/Power_Management_Unit/DMzTzA5V">PMU</a> (Power Management Unit) as well as additional cooling functions. </p>