Manual

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.