<s>
The	O
System	B-Device
Management	I-Device
Unit	I-Device
(	O
SMU	O
)	O
is	O
an	O
advanced	O
internal	O
subsystem	O
introduced	O
in	O
late	O
2004	O
with	O
the	O
iMac	B-Device
G5	I-Device
and	O
Power	B-Device
Mac	I-Device
G5	I-Device
series	O
computers	O
.	O
</s>
<s>
It	O
manages	O
the	O
functions	O
previously	O
governed	O
by	O
the	O
PMU	B-Device
(	O
Power	B-Device
Management	I-Device
Unit	I-Device
)	O
as	O
well	O
as	O
additional	O
cooling	O
functions	O
.	O
</s>
<s>
Power	O
consumption	O
and	O
temperature	O
are	O
monitored	O
by	O
the	O
operating	B-General_Concept
system	I-General_Concept
,	O
which	O
communicates	O
the	O
necessary	O
adjustments	O
back	O
to	O
the	O
SMU	O
.	O
</s>
