Install the GPU power distribution board (trained technician only)

Use this information to install the GPU power distribution board.

Procedure

1. Align the connector with the slot and place the GPU power distribution board into the node.
   Figure 2. GPU power distribution board installation
   
   
2. Fasten the two screws to secure the GPU power distribution board with the node.
   Figure 3. GPU power distribution board screw installation
   
   
3. 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.

4. Unfold the water loop and place it onto the GPU node.
   Figure 7. Unfolding the water loop to GPU node
   
   
5. Loosen water loop carrier screws (x20 Phillips #2 screws).
   Figure 8. Water loop screws and quick connect screws installation (GPU node)
   
   
6. Remove the water loop carrier from the GPU node.
   Figure 9. Water loop carrier removal (GPU node)
   
   
7. 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
      
      
8. 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
   
   
9. 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)
   
   
10. 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)
    
    
11. 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)
    
    
12. Install the cable tie to the GPU board.
    Figure 16. Installing the cable tie
    
    
13. 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