MSI WindBOX III Plus Manual page 48

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BIOS Setup
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Deep S5
The setting enables/disables the Deep S5 power saving mode. S5 is almost
the same as G3 Mechanical Off, except that the PSU still supplies power,
at a minimum, to the power button to allow return to S0. A full reboot is
required. No previous content is retained. Other components may remain
powered so the computer can "wake" on input from the keyboard, clock,
modem, LAN, or USB device.
** Advanced Resume Events Control **
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USB from S3/S4
The item allows the activity of the USB device to wake up the system from
S3/S4 sleep state.
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OnChip GbE from S5
This field specifies whether the system will be awakened from power saving
modes when activity or input signal of onchip LAN is detected.
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PCIE PME
This field specifies whether the system will be awakened from power saving
modes when activity or input signal of onboard PCIE PME is detected.
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Ring
An input signal on the serial Ring Indicator (RI) line (in other words, an
incoming call on the modem) awakens the system from a soft off state.
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RTC
When [Enabled], your can set the date and time at which the RTC (real-time
clock) alarm awakens the system from suspend mode.
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