Install a GPU (trained technician only)

Use this information to install a GPU.

About this task

Important

Gap pad/putty pad replacement guidelines

• To identify the gap pad/putty pad location and orientation, see:

  • Required Tools list in the following section.

  • Gap pad/Putty pad identification and location

• Before replacing the gap pad/putty pad, gently clean the interface plate or the hardware surface with an alcohol cleaning pad.

• Hold the gap pad/putty pad carefully to avoid deformation. Make sure no screw hole or opening is blocked by the gap pad/putty pad material.

• Do not use expired putty pad. Check the expiry date on putty pad package. If the putty pads are expired, acquire new ones to properly replace them.

Required tools

Make sure you have the required tools listed below in hand to properly replace the component.

• SD665-N V3 Water Loop Service Kit (The water loop carrier in the Service Kit is reusable, it is recommended to keep it at the facility where the server operates for future replacement needs.)

• SD665-N V3 Water Loop Putty Pad Kit

• SD665-N V3 SXM5 PCM Fixture

• SXM5 PCM Kit (for removing PCM from GPU)

  Putty pad cannot be reused. Whenever the water loop is removed, putty pads must be replaced with new ones before reinstalling the water loop.

• Screws and screwdrivers

  Prepare the following screwdrivers to ensure you can install and remove corresponding screws properly.

  Screwdriver Type	Screw Type
  Hex screwdriver	6 mm hex head screwdriver
  Torx T10 head screwdriver	Torx T10 screw
  Phillips #1 head screwdriver	Phillips #1 screw
  Phillips #2 head screwdriver	Phillips #2 screw

Attention

• Read Installation Guidelines and Safety inspection checklist to ensure that you work safely.

• Turn off the corresponding DWC tray that you are going to perform the task on.

• Disconnect all external cables from the enclosure.

• Use extra force to disconnect QSFP cables if they are connected to the solution.

• To avoid damaging the water loop, always use the water loop carrier when removing, installing or folding the water loop.

• A torque screwdriver is available for request if you do not have one at hand.

The following illustration shows the GPU numbering.

Figure 1. GPU numbering

Firmware and driver download: You might need to update the firmware or driver after replacing a component.

• Go to Drivers and Software download website for ThinkSystem SD665-N V3 to see the latest firmware and driver updates for your server.

• Go to Update the firmware for more information on firmware updating tools.

Procedure

1. Gently place the GPU down on the GPU board; then, install the four Torx T15 screws with a torque screwdriver set to the proper torque.
   Note

   For reference, the torque required for the screws to be fully tightened/removed is 0.45-0.56 N-m, 4.0-5.0 in-lbf.

   Figure 2. GPU installation
   
   

   Figure 3. GPU screw tightening sequence
   
   

Make sure to follow Gap pad/putty pad replacement guidelines.

2. Replace the Phase Change Material (PCM) and putty pads on the GPU node water loop with new ones.
   1. Install the PCM jig on the GPU cold plate.
   2. Attach the PCM to the square opening of the jig.
   3. Repeat to replace the PCM of all four GPU cold plates.
      Attention

      • PCM cannot be reused. PCM must be replaced with new ones every time the water loop is removed.

      • After PCM is replaced, there is an expected short duration of throttling before the GPU returns to normal operation. This is due to the PCM requiring a break-in period after being replaced.

      Figure 4. Water loop GPU cold plate PCM replacement (GPU node)
      
      
   4. Replace the putty pads on the GPU node water loop.
      Attention

      Putty pad cannot be reused. Whenever the water loop is removed, putty pads must be replaced with new ones before reinstalling the water loop.

      Figure 5. Water loop putty pads replacement (GPU node)
      
      
   5. Replace the putty pads (x5) on the GPU. Make sure to align the putty pads to the GPU VR (1) and the markings on GPU. Repeat to replace all putty pads on the four GPUs.

      1 GPU VR (Cover the GPU VR with putty pad)

      Attention

      Putty pad cannot be reused. Whenever the water loop is removed, putty pads must be replaced with new ones before reinstalling the water loop.

      Figure 6. GPU putty pads replacement
      
      

Make sure to follow Gap pad/putty pad replacement guidelines.

3. Unfold the water loop and place it onto the GPU node.
   Figure 7. Unfolding the water loop to GPU node
   
   
4. Loosen water loop carrier screws (x20 Phillips #2 screws).
   Figure 8. Water loop screws and quick connect screws installation (GPU node)
   
   
5. Remove the water loop carrier from the GPU node.
   Figure 9. Water loop carrier removal (GPU node)
   
   
6. Install GPU cold plate screws (x16 T10 screws).
   1. Install GPU cold plate screws following the GPU cold plates installation sequence: GPU 2 > GPU 4 > GPU 1 > GPU 3
      Figure 10. GPU numbering
      
      
   2. Set the torque screwdriver to 1.5 +/- 0.5 lb-In (0.1 +/- 0.06 N-m); then, fasten the GPU cold plate screws.
   3. Set the torque screwdriver to 3.5 +/- 0.5 lb-In (0.4 +/- 0.06 N-m); then, fasten the GPU cold plate screws until all screws are fully tightened.
      Note

      Make sure to follow the screw sequence on the GPU cold plate label: → → →

      Figure 11. GPU cold plate screw installation
      
      
7. Follow the screw installation sequence specified on the network board label, and install network cold plate screws (x8 Torx T10 screws) with a torque screwdriver set to the proper torque.
   Note

   For reference, the torque required for the screws to be fully tightened/removed is 5.0+/- 0.5 lbf-in, 0.55+/- 0.05 N-M.

   Figure 12. Network card screw installation
   
   
8. Install the quick connect screws (x4 Torx T10) with a torque screwdriver set to the proper torque.
   Note

   For reference, the torque required for the screws to be fully tightened/removed is 5.0+/- 0.5 lbf-in, 0.55+/- 0.05 N-M.

   Figure 13. Quick connect screw installation (GPU node)
   
   
9. Install water loop screws and quick connect screws (x13 Torx T10 screws) with a torque screwdriver set to the proper torque.
   Note

   For reference, the torque required for the screws to be fully tightened/removed is 5.0+/- 0.5 lbf-in, 0.55+/- 0.05 N-M.

   Figure 14. Water loop Torx T10 screws installation (GPU node)
   
   
10. Install the Hex screw (x1) and the PH1 screws (x3).
    Note

    For reference, the torque required for the screws to be fully tightened/removed is 5.0+/- 0.5 lbf-in, 0.55+/- 0.05 N-M.

    Figure 15. Water loop Hex and PH1 screws installation (GPU node)
    
    
11. Install the cable tie to the GPU board.
    Figure 16. Installing the cable tie
    
    
12. Connect the carrier board power cable.
    Figure 17. Connecting carrier board power cable
    
    

    Cable	From (carrier board)	To (GPU node power distribution board)
    1 Carrier board power cable	Power and side band connector	Power connector