Chassis Plans ATXP-875P, Техническое описание

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Chapter 1: Pre-Configuration ATXP-875P – Technical Reference
6 Chassis Plans
Designing for thermal performance
In designing for thermal performance, the goal is to keep the processor within the operational thermal specifications.
The inability to do so will shorten the life of the processor.
Fan Heatsink
An active fan heatsink can be employed as a mechanism for cooling the Intel processors. This is the acceptable
solution for most chassis. Adequate clearance must be provided around the fan heatsink to ensure unimpeded air
flow for proper cooling.
Airflow management
It is important to manage the velocity, quantity and direction of air that flows within the system (and how it flows)
to maximize the volume of air that flows over the processor.
Thermal interface management
To optimize the heatsink design for the Pentium 4 processor, it is important to understand the impact of factors
related to the interface between the processor and the heatsink base. Specifically, the bond line thickness, interface
material area, and interface material thermal conductivity should be managed to realize the most effective thermal
solution.
Once used, the thermal interface should be discarded and a new one installed. Never assemble the heatsink with a
previously used thermal interface.
This completes the installation of the CPU. Now is it a good time to double check both the CPU and DIMM
installation to make sure that these devices have been properly installed.
Installing Cables
Power and Control Panel Cables
The ATXP-875P gets power from the power connectors J15 and J16 (Figure 1-4). Use only ATX12V-compliant
power supplies with the board. ATX12V power supplies have an additional power lead that provides required
supplemental power for the processor. Always connect the 20-pin and 4-pin leads of ATX12V power supply to the
corresponding connectors, 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.
Installing Peripheral Cables
Now it is a good time to install the internal peripherals such as floppy and hard disk drives. Do not connect the
power cable to these peripherals, as it is easier to attach the bulky ribbon cables before the smaller power
connectors. If you are installing more than one IDE drive double check your master/slave jumpers on the drives.
Review the information supplied with your drive for more information on this subject.
Connect the floppy cable (not included) to the system board. Then connect remaining ends of the ribbon cable to the
appropriate peripherals. Finally, connect the IDE cable (not included) to the system. If using a Solid State Device,
connect it to the mini-ATA connector. Then connect remaining ends of the ribbon cable to the appropriate
peripherals. This concludes the hardware installation of your ATXP-875P system. Now it is a good time to re-check
all of the cable connections to make sure they are correct.
The connector hole layouts on the ATXP-875P I/O Gasket (optional) are designed according to Intel ATX
specifications.