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Use only ATX12V- or SFX12V-compliant power supplies with the Intel® Desktop Board D845PT.ATX12V and SFX12V power supplies have an additional power lead that provides required supplemental power for the Intel Pentium® 4 processor. Always connect the 20-pin and 4-pin leads of ATX12V and SFX12V power supplies to the corresponding connectors on the board, otherwise the board will not boot. Do not use a standard ATX power supply. The board will not boot with a standard ATX power supply.
There are four things to look for when choosing a chassis (case) and power supply for your Pentium 4 processor-based PC.
- Mechanical Fit
- Thermal Performance
- Fan Operation
- Included Accessories
An Pentium 4 processor-based PC should use at least a 250 watt ATX12V power supply, and a chassis that mechanically supports the processor heat sink assembly.
| Caution |
Failure to use an ATX12V power supply, or not connecting both additional power supply leads to the Intel Desktop Board D845PT may result in damage to the desktop board and/or power supply. | |
System designs based on Pentium 4 processors will require a new type of power supply. This new type is a superset of the original ATX power supply specification and is defined as an "ATX12V" power supply. The extra +12V power connector enables the delivery of more current to the Pentium 4 processor-based boards. The presence of the +12V 4-pin connector indicates that the power supply is an ATX12V. The absence of the +12V 4-pin connector indicates that the power supply is an ATX version.
The new +12VDC connector lies near the processor's DC-to-DC converter and voltage regulators, which affords higher power conversion and transmission efficiencies and future platform flexibility. Additionally, there is a 6-pin Aux connector associated with the ATX12V power supply. This auxiliary power connector provides additional +3.3VDC and +5VDC current.
Your chassis solution must have support for the processor heat sink assembly and additional support mounts for the heat sink. Therefore, it is recommended that you use a chassis that has been designed to mechanically support the Pentium 4 processor.
Visit the Platform Developers Web Site* for more information, such as:
- ATX12V Power Supply Vendors
- ATX12V Power Supply Design Guidelines
This applies to:
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