Install a rear H100/H200 GPU

Follow instructions in this section to install a rear H100/H200 GPU. The procedure must be executed by a trained technician.

About this task

Attention

• Read Installation Guidelines and Safety inspection checklist to ensure that you work safely.
• Touch the static-protective package that contains the component to any unpainted metal surface on the server; then, remove it from the package and place it on a static-protective surface.
• A torque screwdriver is available for request if you do not have one at hand.

Note

Make sure you have the required tools listed below available to properly replace the component:

• Torx T10 head screwdriver
• Torx T15 head screwdriver
• Phillips #1 head screwdriver
• Phillips #2 head screwdriver
• Flat head screwdriver
• Alcohol cleaning pad
• H100/H200 PCM Kit
• SR780a V3 water loop putty pad kit
• SR780a V3 water loop service kit

Important

Putty pad/phase change material (PCM) replacement guidelines

• Before replacing the putty pad/PCM, gently clean the hardware surface with an alcohol cleaning pad.
• Hold the putty pad/PCM carefully to avoid deformation. Make sure no screw hole or opening is blocked by the putty pad/PCM.
• Do not use expired putty pad/PCM. Check the expiry date on putty pad/PCM package. If the putty pads/PCM are expired, acquire new ones to properly replace them.

The following illustration shows the GPU numbering and corresponding slot numbering in XCC.

Figure 1. GPU numbering

Procedure

1. (Optional) For new GPU, remove the connector covers at the bottom.
   Figure 2. Removing connector covers
   
   
2. Gently place the GPU down on the GPU baseboard.
3. Follow the sequence shown in the illustration below to fasten the four Torx T15 screws to secure the GPU to the GPU baseboard.
   Note

   First set the torque screwdriver to 0.1-0.12 newton-meters, 0.9-1.1 inch-pounds to fasten the screws for a few rounds. Then set the torque screwdriver to 0.58-0.62 newton-meters, 5-5.5 inch-pounds to fully fasten the screws.
   Figure 3. Installing the GPU
   
   
4. Replace the Phase Change Material (PCM) on the rear GPU cold plate.
   1. Remove the liner from one side of the pad.
   2. Align the PCM with the marking on the bottom of the cold plate, and place it onto the cold plate; then, apply finger pressure across the entire surface area of the PCM to remove any trapped air and allow 1-2 minutes dwell time until it is firmly attached. Carefully remove the remaining top liner.
      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. PCM application

      
      
      
5. Replace the putty pads (x5) on the GPU.
   1. Remove the liner from one side of the pad.
   2. Make sure to align the putty pads to the GPU VR (1) and the markings on GPU; then, place the pads onto the GPU and apply light finger pressure across the entire surface area of the pads to ensure adhesion. Carefully remove the remaining top liner.
      Attention

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

      Figure 5. GPU putty pads replacement
      
      

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

6. Remove the service bracket and GPU cold plate assembly from the manifold.
   1. Loosen the captive screw that secure the service bracket to the manifold.
   2. Lift the service bracket and GPU cold plate assembly away from the manifold to remove it.
      Figure 6. Removing the service bracket and the GPU cold plate assembly
      
      
7. Place the cold place onto the GPU.
   1. Flip over the service bracket and GPU cold plate assembly; then, gently place the GPU cold plate onto the GPU.
   2. Adjust the cold plate until the two guide pins are seated in the guide holes on the GPU.
      Figure 7. Adjusting the cold plate
      
      
8. Loosen the captive screw to remove the service bracket from the cold plate.
   1. Loosen the captive screw that secure the service bracket to the GPU cold plate.
   2. Lift the service bracket away from the GPU cold plate to remove it.
      Figure 8. Removing the service bracket
      
      
9. Follow the screw sequence specified on the cold plate label, and fully tighten the four Torx T10 screws with a torque screwdriver set to the proper torque.
   1. Set the torque screwdriver to 0.4±0.05 newton-meter, 3.5±0.5 pound-inch.
   2. Fasten the screws 720 degrees following the screw installation sequence: → → →
      Note

      Make sure to follow screw installation sequence to prevent GPU cold plate tilting.
   3. Repeat until all screws on the four GPU cold plates are fully tightened.
   Figure 9. Repeat to fully tighten all the screws
   
   

   Figure 10. Installing the GPU cold plate
   
   
10. Reinstall the leakage sensor module cable to the GPU cold plate.
    1. Remove the leakage sensor module cable from the adjacent cable clips.
    2. Route the leakage sensor module cable back onto the GPU cold plate; then, reinstall it in the cable clips on the cold plate.
       Figure 11. Installing the leakage sensor module cable