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Intel Desktop Board D915GEV/D915GUX/D915GAV/D915GAG Product Guide
24
Power Connectors
The desktop boards have three power connectors. See Figure 25 on page 49 and Figure 26 on
page 50 for the location of the power connectors.
Fan Connectors
The desktop boards have a 4-pin processor fan header.
Desktop boards D915GAV and D915GEV have three chassis fan headers. Desktop boards
D915GAG and D915GUX have two chassis fan headers. See Figure 24 on page 48 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 boards D915GEV and D915GAV 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
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.
Suspend to RAM (Instantly Available PC Technology)
CAUTION
For Instantly Available PC technology, the 5 V standby line for the power supply must be capable
of delivering adequate +5 V standby current. Failure to provide adequate standby current when
using this feature can damage the power supply and/or effect ACPI S3 sleep state functionality.
CAUTION
Power supplies used with this desktop board must be able to provide enough standby current to
support the standard Instantly Available (ACPI S3 sleep state) configuration. If the standby
current necessary to support multiple wake events from the PCI and/or USB buses exceeds power
supply capacity, the desktop board may lose register settings stored in memory.