IEI Integration PCIE-Q350 v1.00 - Manual (Page 152)

PCIE-Q350 PICMG 1.3 CPU Card
Page 130
6.3.5 ACPI Configuration
Use the ACPI Configuration menu (BIOS Menu 8) to select the ACPI state when the
system is suspended.
BIOS Menu 8: Advanced ACPI Configuration
Suspend Mode [S1(POS)]
Use the Suspend Mode option to specify the sleep state the system enters when it is not
being used.
S1 (POS) The system enters S1(POS) sleep state. The system
appears off. The CPU is stopped; RAM is refreshed; the
system is running in a low power mode.