An apparatus and method is disclosed for reducing power consumption in a
computing system by moving pages allocated in real memory portions to
other real memory portions. When a real memory portion contains no pages,
that memory portion can be put into a Deep Power Down (DPD) state that
has lower power consumption than when that memory portion is in normal
operation. The computing system can also be aware of power consumption of
each real memory portion, and, with such awareness, the invention teaches
consolidation of pages from real memory portions having relatively higher
power consumption to real memory portions having relatively lower power
consumption.