Processors
OverDriveŽ Processors
Interposer Installation on Intel486™ CPU-Based Systems

    A number of systems were produced which incorrectly support the WriteBack mode of the Pentium® OverDrive® processor. As a result, these systems do not operate correctly when upgraded with the Pentium® OverDrive® processor. In order to allow owners of these systems to still be able to upgrade to Pentium processor technology, Intel has made an interposer available. This interposer works around the design implementation errors in these systems by disabling the WriteBack mode, thereby enabling the systems to operate correctly. To install the Pentium® OverDrive® processor using the interposer:
    Step 1: Ground yourself, then unplug your system and remove the cover.
    Prevent possible electrostatic damage to your system and the processor by grounding yourself. To ground yourself, touch a metal part such as the external monitor port on the back of your system. Limit your movements during installation to reduce static electricity.

removing cover

    Step 2: Remove the interposer socket with its anti-static foam backing from the package and place on a flat work surface.
    Remove the Pentium® OverDrive® processor from its package.
    Step 3: Remove the Pentium® OverDrive® Processor fan.
    To remove the Pentium® OverDrive® processor fan:
      1. Release the corner of the fan assembly by gently squeezing together the two retaining clips.

      2. While keeping the clips squeezed together, slowly lift up the corner, pivoting it against the opposite corner.

        removing fan assembly


      3. When the fan assembly is at an approximately 45° angle, gently lift straight up from the processor.

      4. Place the fan assembly on its back, being careful not to damage the contact pins.
    Step 4: Carefully orient your Pentium® OverDrive® processor to the interposer socket, aligning the pins to the socket pinholes.
    Match the corner of the interposer socket with the distinctive pinhole arrangement to the corner of the Pentium OverDrive processor with the blunted edge and distinctive pin arrangement as shown.
    Step 5: Insert the Pentium OverDrive processor in the interposer socket and press gently to seat.
    To seat, push gently and evenly on opposing corners of the Pentium OverDrive processor at the same time. Since you have removed the fan assembly, you can also apply pressure to the middle of the processor. As you press, you should be able to feel the Pentium OverDrive processor slide into place. When the Pentium OverDrive processor is fully inserted, there is a gap between the Pentium OverDrive processor and the interposer socket, and top of the pins are visible. The gap should be even around each side of the Pentium OverDrive processor, and about the same thickness as the chip removal tool (the 'rake' included in the Pentium OverDrive processor package.)

proper alignment

    Step 6: Replace the Pentium® OverDrive® processor fan.
    To replace the Pentium OverDrive processor fan:

      1. Hold the fan at an approximately 45° angle, and align the fan assembly over the base unit, starting with the corner opposite the retaining clip. Take special care to align the contact pins on the fan assembly to the three pads on the base unit.

        replacing fan assembly

      2. Carefully lower the fan down onto the base.

      3. Secure the fan assembly to the base unit by ensuring the retaining clips have snapped into place.

    Step 7: Open the handle of your system's Pentium® OverDrive® processor socket.
    For more information on identifying your Pentium OverDrive processor socket, refer to your system manual or the Intel OverDrive® Processor Installation Manual included with your Pentium OverDrive processor.

    Step 8: Orient and align the Pentium OverDrive processor with the interposer socket to your system's Pentium OverDrive socket. The Pentium OverDrive processor socket contains a key pin hole, an additional hole in one corner of the inside pin hole row. The key pin hole corner serves as a landmark for you to match the corresponding corner of the Pentium OverDrive processor which contains a blunt edge and different pin arrangement as shown. For more information on correctly orienting your Pentium OverDrive processor, refer to your system manual or the Intel OverDrive® Processor Installation Manual.

replacing processor assembly

    Step 9: Place the Pentium OverDrive processor with the interposer socket in the Pentium OverDrive processor socket and close handle.

    Step 10: Set jumpers on the motherboard. Check your system manufacturer's user manual for the correct settings. For more information on how to set jumpers, refer to the Intel OverDrive® Processor Installation Manual.

      CAUTIONFor Packard-Bell* systems with PB450* or PB490* motherboards and Zenith* Data Systems Z-SELECT 100*: Find the jumpers labelled J28 and place the jumper connection over pins 2 and 3. Note that these settings are different from the ones in the Packard-Bell owner's manual.

      CAUTIONFor Packard-Bell* systems PB470* and Zenith* Data Systems Z-STATION 510*: Find the jumpers labelled J34 and place the jumper connection over pins 2 and 3. Note that these settings are different from the ones in the Packard-Bell owner's manual.

    Step 11: Complete your Pentium OverDrive processor installation as outlined in the Intel® OverDrive® Processor Installation Manual.
    Once you have placed the cover back on your system and turned it on, you can use the diagnostics included with your Pentium OverDrive processor package to test your installation, or simply use a favorite software package and experience the power of your Pentium OverDrive processor upgrade.

    CAUTIONIf installation seems complicated after reading the Intel OverDrive® Processor Installation Manual and these instructions, have a qualified technician install the Pentium OverDrive processor for you.

    CAUTION We don't recommend removing the interposer from the Pentium OverDrive processor as it is firmly attached; however, if you do decide to remove it, please make sure you use the proper chip extraction tool and gingerly separate the interposer from the processor, or have a qualified technician professionally perform the task for you. You can obtain the chip extraction tool by contacting Intel® Customer Support.

THIS INTERPOSER PART IS COVERED BY THE SAME INTEL LIMITED WARRANTY THAT CAME WITH THE ORIGINAL PURCHASER'S PENTIUM® OVERDRIVE® PROCESSOR. PLEASE REFER TO THE MATERIALS IN THE ORIGINAL PACKAGING THAT ACCOMPANIED YOUR PENTIUM OVERDRIVE PROCESSOR FOR A COPY OF INTEL'S WARRANTY. INTEL MAKES NO EXPRESS WARRANTIES FOR THIS INTERPOSER PART AND DISCLAIMS ALL OTHER WARRANTIES INCLUDING (WITHOUT LIMITATION) IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND WARRANTIES ARISING OUT OF PROPOSAL, SPECIFICATION OR SAMPLE.

This applies to:

OverDriveŽ Processors



Solution ID: CS-012627
Last Modified: 11-Dec-2014
Date Created: 22-Jun-2004
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