Intel D915PBL Product Guide - Page 19

Desktop Board Features Power Management Features Power management is implemented at several levels, including: • Advanced Configuration and Power Interface (ACPI) • Hardware support: Fan connectors Suspend to RAM (Instantly Available PC technology) Resume on Ring 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. Fan Connectors Desktop Board D915PBL has three chassis fan headers (3-pin) and one processor fan header (4-pin). See Figure 23 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 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 D915PBL are controlled. Refer to Table 2 on page 12 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 full speed if it is not a self controlled fan. It is recommended that processor fan speed control remain enabled (default BIOS setting) when using the processor fan heat-sink included with Intel boxed processors. Disabling the chassis fan speed control results in chassis fans always operating at full speed. The chassis fan speed control feature should be disabled if a self-controlled chassis fan is attached to any controlled chassis fan header. The overall system noise reduction will vary based on system configuration and environment. 19