The following is an integration guide designed to inform you of the new integration issues related to the desktop D845WN and D845HV platform. The following information is a progressive integration brief providing information needed to correctly build an Intel® Pentium® 4 processor platform.

Chassis supporting the Pentium 4 processor in the 478-pin package have key requirements. These chassis have an ATX12V or SFX12V power supply and are designed for superior ventilation. The Pentium 4 processor in the 478 pin package does not require the four special mounting holes for direct attach thermal solution.

Once the board has been installed and secured to the chassis, install the retention mechanism (RM) to the board in the following manner. First, remove the four white pushpins from the retention mechanism. Place the retention mechanism on the motherboard, aligning it with the four holes located adjacent to the processor socket. Push down on the four fasteners to secure the retention mechanism to the motherboard. Use the white pushpins to lock the retention mechanism into place. The RM provides four anchor points for the fan heatsink clip assembly, which will secure the fan heatsink.

The boards are equipped with a 478-pin socket specifically designed for the Pentium 4 processor in the 478-pin package. It is not compatible with Intel Pentium III or Celeron® processors or the Pentium 4 in the 423 pin package. The installation process for the Pentium 4 processor is the same as seen with previous zero insertion force (ZIF) processor sockets.

The thermal interface material is attached to the bottom of the heatsink. Be careful not to damage the thermal interface material, when handling the fan heatsink. The thermal interface material included with the boxed processor is required for proper heat transfer between the processor and heatsink; therefore, it should not be substituted with an off the shelf product. When changing the heatsink or processor, a new application of thermal interface material is required.

Place the fan heatsink and clip assembly directly on the processor, allowing the heatsink to compress the thermal interface material over the surface of the processor's integrated heat spreader. With the clip levers in the up position, push down on the four clip frame corners, to secure the clip assembly to the retention mechanism. Close the clip levers in opposing directions (levers require force to be completely closed), to fasten the heatsink to the retention mechanism. Once the heatsink is secured, install the fan power connector onto the board to the fan header closest to the processor labeled "CPU Fan" at J2F1. This is the same for both boards.

The boards support combinations of no more than 4 SDRAM chips. The boards will accept only PC133 DIMMs with a minimum of 32MB and a maximum of 4GB of system memory. The board will issue three long beeps to indicate non-support memory the DIMMs are not PC133. To add additional memory, Populate any of the empty slots with SDRAM DIMMs.

The boards support Ultra ATA/66 and Ultra ATA/100 transfer rates. The board package includes two IDE cables. The 40-contact cable supports the Ultra DMA-33 transfer protocol. The 40-contact 80-conductor cable supports ATA-66 and ATA-100 transfer protocols. If you are using an Ultra ATA/66 or Ultra ATA/100 hard drive, you must use the 40-pin, 80-conductor IDE cable. Both the board and the cable are backward compatible with previous IDE transfer protocols. Install the IDE cable in the following orientation:

1. Plug the blue connector at the end of the cable into the desktop board.
2. Plug the other end connector into the master drive.
3. Plug the middle connector into the slave drive if it is

The AGP connector supports 1.5V 4X and 2X AGP cards. The connector is keyed so that only 1.5V AGP cards may be installed. It should be noted that there are currently AGP cards available that are keyed for 1.5V connectors, but they can be configured to run at 3.3V. It is important to only use the latest AGP cards that support 1.5V 4X and 2X cards.

When using notched cards, install the AGP card retention mechanism before installing the card. The retention mechanism should not be used with unnotched cards.