Intel D955XCS - Manual (Page 19)

Desktop Board Features
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For instructions on resetting the password, see Clearing Passwords on page 52.
Chassis Intrusion
The desktop 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 25 on page 46 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:
⎯ 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 D955XCS has three chassis fan headers (two 3-pin and one 4-pin) and one
processor fan header (4-pin).
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.
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.