Aaeon SBC-558P Manual page 61

Standby Mode
After the selected period of system inactivity, the CPU clock stops,
the hard drive enters an idle state, and the L2 cache enters a power-
save mode. All other devices still operate at full speed.
Suspend Mode
After the selected period of system inactivity, the chipset enters a
hardware suspend mode, stopping the CPU clock and possibly
causing other system devices to enter power management modes.
52 SBC-558P User Manual