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Install a processor and heat sink (trained technician only)

Follow the instructions in this section to install an assembled processor and heat sink, known as a processor-heat-sink module (PHM). This task requires a Torx T30 driver. This procedure must be executed by a trained technician.

This task must be operated by trained technicians.

About this task

disconnect all power
The power-control button on the device and the power switch on the power supply do not turn off the electrical current supplied to the device. The device also might have more than one power cord. To remove all electrical current from the device, ensure that all power cords are disconnected from the power source.
  • Read Installation Guidelines and Safety inspection checklist to ensure that you work safely.

  • Power off the server and disconnect all power cords for this task. See Power off the server.

  • Prevent exposure to static electricity, which might lead to system halt and loss of data, by keeping static-sensitive components in their static-protective packages until installation, and handling these devices with an electrostatic-discharge wrist strap or other grounding system.

  • Each processor socket must always contain a cover or a PHM. When removing or installing a PHM, protect the empty processor sockets with a cover.

  • Do not touch the processor socket or processor contacts. Processor-socket contacts are very fragile and easily damaged. Contaminants on the processor contacts, such as oil from your skin, can cause connection failures.

  • Do not allow the thermal grease on the processor or heat sink to come in contact with anything. Contact with any surface can compromise the thermal grease, rendering it ineffective. Thermal grease can damage components, such as the electrical connectors in the processor socket.

  • Remove and install only one PHM at a time. If the system board supports multiple processors, install the PHMs starting with the first processor socket.

    Figure 1. Processor locations on the system board
    Processor locations on system board
  • The heat sink, processor, and processor carrier might look different from the illustrations in this section.

  • PHMs are keyed for the socket where they can be installed and for their orientation in the socket.

  • See Lenovo ServerProven website for a list of processors supported for your server. All processors on the system board must have the same speed, number of cores, and frequency.

  • Before you install a new PHM or replacement processor, update your system firmware to the latest level. See Update the firmware.

The following illustration shows the components of the PHM.

Figure 2. PHM components
PHM components
1 Heat sink9 Clips to secure processor in carrier
2 Heat sink triangular mark10 Carrier triangular mark
3 Processor identification label11 Processor ejector handle
4 Nut and wire bail retainer12 Processor heat spreader
5 Torx T30 nut13 Thermal grease
6 Anti-tilt wire bail14 Processor contacts
7 Processor carrier15 Processor triangular mark
8 Clips to secure carrier to heat sink 
Firmware and driver download: You might need to update the firmware or driver after replacing a component.


  1. When replacing a processor and reusing the heat sink:
    1. Remove the processor identification label from the heat sink and replace it with the new label that comes with the replacement processor.
    2. If there is any old thermal grease on the heat sink, wipe the thermal grease from the bottom of the heat sink with an alcohol cleaning pad.
  2. When replacing a heat sink and reusing the processor.
    1. Remove the processor identification label from the old heat sink and place it on the new heat sink in the same location. The label is on the side of the heat sink closest to the triangular alignment mark.
      When unable to remove the label and place it on the new heat sink, or if the label is damaged during transfer, write the processor serial number from the processor identification label on the new heat sink in the same location as the label would be placed using a permanent marker.
    2. Install processor in the new carrier.
      Replacement heat sinks come with both gray and black processor carriers. Make sure to use the carrier with the same color as the one discarded earlier.
      1. Make sure the handle on the carrier is in the closed position.

      2. Align the processor on the new carrier so that the triangular marks align; then, insert the marked end of the processor into the carrier.

      3. Hold the inserted end of the processor in place; then, pivot the unmarked end of the carrier down and away from the processor.

      4. Press the processor and secure the unmarked end under the clip on the carrier.

      5. Carefully pivot the sides of the carrier down and away from the processor.

      6. Press the processor and secure the sides under the clips on the carrier.

        To prevent the processor from falling out of the carrier, keep the processor-contact side up and hold the processor-carrier assembly by the sides of the carrier.
      Figure 3. Installation of a processor carrier
      Installing a processor carrier
  3. Apply thermal grease.
    1. Carefully place the processor and carrier in the shipping tray with the processor-contact side down. Make sure the triangular mark on the carrier is aligned with the triangular mark in the shipping tray.
    2. If there is any old thermal grease on the processor, gently wipe the top of the processor with an alcohol cleaning pad.
      Make sure the alcohol has fully evaporated before applying new thermal grease.
    3. Apply the thermal grease on the top of the processor with syringe by forming four uniformly spaced dots, while each dot consists of about 0.1 ml of thermal grease.
      Figure 4. Thermal grease application with processor in shipping tray
      Thermal grease application with processor in shipping tray
  4. Assemble the processor and heat sink.
    1. Align the triangular mark on the heat sink label with the triangular mark on the processor carrier and processor.
    2. Install the heat sink onto the processor-carrier.
    3. Press the carrier into place until the clips at all four corners engage.
      Figure 5. Assembling the PHM with processor in shipping tray
      Assembling the PHM with processor in shipping tray

      Visually inspect to make sure that clips at all four corners fully engage
  5. Install the processor-heat-sink module into the system board socket.
    1. Rotate the anti-tilt wire bails inward.
    2. Align the triangular mark and four Torx T30 nuts on the PHM with the triangular mark and threaded posts of the processor socket; then, insert the PHM into the processor socket.
    3. Rotate the anti-tilt wire bails outward until they engage with the hooks in the socket.
    4. Fully tighten the Torx T30 nuts in the installation sequence shown on the heat-sink label. Tighten the screws until they stop; then, visually inspect to make sure that there is no gap between the screw shoulder beneath the heat sink and the processor socket. (For reference, the torque required for the fasteners to fully tighten is 1.1 newton-meters, 10 inch-pounds).
      Figure 6. Installing a standard PHM
      Installing a standard PHM

After this task is completed

  1. Reinstall the air baffle. See Install an air baffle.

  2. Reinstall all the flash power modules, if necessary. See Install a flash power module.

  3. Reinstall the server cover. See Install a server cover.

  4. Reinstall the redundant power supply unit. See Install a power supply unit.

  5. Complete the parts replacement. See Complete the parts replacement.