System Cooling Requirements
Systems that contain
Intel® Pentium® 4 processors operating at 3
GHz or higher require a heatsink and chassis that provide
airflow adequate to ensure appropriate internal ambient
temperature and cooling of the components in the system.
The fan heatsink must provide appropriate airflow
for the processor and nearby board components. The
boxed Intel® Pentium® 4 processors at 3 GHz or higher
ship with a heatsink that supplies appropriate airflow
for the processor and nearby board components.
to use a fan heatsink and a chassis with appropriate
airflow may result in reduced performance or, in some
instances, damage to the motherboard.
Total system power consumption is dependent
upon the system configuration, including add-in boards,
peripherals, memory, and the Intel® processor powered
by the system's power supply.
Instances of using undersized
power supplies have resulted in add-in boards and peripherals
that do not function properly, and includes the device
drivers used for those add-in boards and peripherals.
This information is provided only as a guide. Calculating
approximate power usage of the system is important
to ensure that the power supply meets the system's
Use the correct power
supply to avoid "no boot" situation or lock-up.
An ATX12V or SFX12V with the 2x2 connector is required
for all Pentium® 4 processor based Intel® Desktop
Boards. Power consumption requirements for high-end
video cards, sound cards, peripherals, and the Pentium
4 processor will exceed the typical 5A current capacity
of standard ATX & SPX power supplies.
and SFX12V† power supply design guides recommend
a minimum of 8A at 12Volts to properly power any Pentium
4 processor based Intel Desktop Board. Standard ATX
and SFX power supplies typically provide approximately
5A of current, which is not capable of reliably powering
the Pentium 4 processor based Intel Desktop Board.
more information: http://www.formfactors.org/
Intel Thermal Zone Information
monitoring software (Intel® Active Monitor or Intel® Desktop
Utilities) monitors system temperature in up to three
locations on the desktop board:
Zone: monitors the processor; the thermal diode is
on the processor itself.
- Zone 1: monitors
the area around the hardware monitoring ASIC (near
the processor socket).
- Zone 2: monitors the
area around an additional remote sensor; this location
is dependent on board model.
and system zone temperature sensors are designed to
provide you with approximate temperatures so that unusually
high temperatures can be quickly and easily detected.
Because the temperature measurements are approximate,
they should not be used to validate thermal solutions.
The temperatures that Intel® Active Monitor or
Intel® Desktop Utilities displays are read from
the desktop board's hardware monitor ASIC, which is
designed to indicate temperature trends only. All responsibility
for determining the adequacy of any thermal or system
design remains solely with the customer. Intel makes
no warranties or representations that merely following
the instructions presented in this document or the
Technical Product Specification (TPS) will result in
a system with adequate thermal performance.
TPS contains information about the maximum temperatures
allowed in each thermal zone.
To locate the TPS for
1. Go to the Desktop
Board Main Index.
2. Select your board.
3. Click the link in the left
navigation menu to Product Documentation.
monitoring software, such as Intel® Active Monitor
or Intel® Desktop Utilities are designed to alert
you when temperatures exceed certain thresholds.
If Intel® Active Monitor or
Intel® Desktop Utilities alerts you about temperatures
above set thresholds, there are a number of steps you
Check for proper airflow:
- Make sure
the processor and chassis fans are running.
- Check the cabling; make sure cables are not interfering
with proper airflow through the chassis.
that nothing is blocking airflow into and out of the
chassis' airflow vents.
- Make sure that the
air intakes for the external fans are unobstructed
and are located at least several inches away from walls
and other items.
- Make sure that the power
supply fan is running properly and any other external
case fans are running properly.
- Consider adding
another chassis fan.
Other troubleshooting steps:
your PC uses an Intel® Pentium® 4 processor
in the LGA775 package, be sure the heatsink is properly
installed and 'locked'. Pay particular attention to
the proper orientation of the locking pins and give
a good push down on the pins (sounds like a double
click) to lock them into place. For complete processor
and heatsink integration information, refer to Boxed
- Verify the chassis/case
and power supply are appropriate for the processor
model and frequency and the motherboard you are using.
the thermal solution for the processor is adequate
for the processor and frequency of the processor.
sure the processor fan cable is connected to the correct
fan header (specifically for the processor). Refer
to your motherboard documentation for more information.
sure that the thermal interface material or the thermal
grease is applied to the processor properly.
the system BIOS to the newest version. This will often
correct problems with how the system measures temperature.
Setting Temperature Thresholds in Intel® Active
Monitor or Intel® Desktop Utilities
the temperature thresholds in the hardware monitoring
software are set as follows:
Intel® Active Monitor
Utilities (ver. 126.96.36.199 and earlier)
Utilities (ver. x and later)
If you've checked for proper airflow and performed
the other troubleshooting steps listed above and you
still consistently receive high temperature alerts
in Zone 1 or Zone 2:
- If you are using Intel® Active
Monitor, you may increase the temperature threshold.
You can safely increase the Zone 1 or Zone 2 threshold
up to 60 Degrees Celsius (140 Degrees Fahrenheit).
you are using Intel® Desktop Utilities version
188.8.131.52 or earlier, upgrade
the software to the latest version, which sets the Zone 1 and 2 thresholds to
- It is not recommended that you increase
the Processor Zone threshold.
3-pin and 4-pin Fan Connectors
Chassis and CPU fans
may use either 3-pin or 4-pin power connectors. 3-pin
connectors are usually used for the smaller chassis
fans with lower power consumption. 4-pin connectors
are usually used by CPU fans with higher power consumption.
Fans and on-board fan headers are backwards compatible.
Proper fan connector placement is shown in the figures
Fan has a 3-pin power connector; desktop board has
a 4-pin fan header:
Note: when using a 3-pin power connector with a 4-pin
fan header, the fan will always be on; there is no
Fan has a 4-pin power connector;
desktop board has a 3-pin fan header: