Intel D915GMH English Manual Product Guide - Page 20

Intel Desktop Board D915GMH Product Guide Chassis Intrusion The board supports a chassis security feature that detects if the chassis cover has been removed. The security feature uses a mechanical switch on the chassis that can be connected to the chassis intrusion header on the desktop board. See Figure 19 on page 42 for the location of the chassis intrusion header. Power Management Features Power management is implemented at several levels, including: • Advanced Configuration and Power Interface (ACPI) • Hardware support:  Power connectors  Fan connectors  Suspend to RAM (Instantly Available PC technology)  Wake from USB  Wake from PS/2 keyboard/mouse  PME# wakeup support ACPI ACPI gives the operating system direct control over the power management and Plug and Play functions of a computer. The use of ACPI with the desktop board requires an operating system that provides full ACPI support. Power Connectors The desktop board has three power connectors. See Figure 22 on page 47 and Figure 23 on page 48 for the location of the power connectors. Fan Connectors The desktop board has a 4-pin processor fan header and two 3-pin chassis fan headers. See Figure 21 on page 46 for the location of the fan headers. Fan Speed Control (Intel® Precision Cooling Technology) Intel Precision Cooling Technology automatically adjusts the processor fan speed based on the processor thermal diode temperature and adjusts the chassis fan speeds depending on the system temperature. System fan noise may be reduced by operating controlled chassis and processor fans at the minimum necessary speeds. NOTE Not all chassis fan headers on desktop board D915GMH are controlled. Refer to Table 3 on page 13 to identify controlled chassis fan headers. The processor and chassis fan speed control features can be disabled independently through the desktop board BIOS. Disabling the processor fan speed control will result in the fan operating at 20