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Install a GPU

Use this information to install a GPU board.

About this task

shock hazard
Electrical current from power, telephone, and communication cables is hazardous.

To avoid a shock hazard:

  • Connect all power cords to a properly wired and grounded electrical outlet/source.
  • Connect any equipment that will be attached to this product to properly wired outlets/sources.
  • When possible, use one hand only to connect or disconnect signal cables.
  • Never turn on any equipment when there is evidence of fire, water, or structural damage.
  • The device 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 the following sections to ensure that you work safely.
  • Turn off the corresponding DWC tray that you are going to perform the task on.
    If Shared I/O adapters are installed, power off the auxiliary node (node 1/3/5/7/9/11) first, and then power off the primary node (node 2/4/6/8/10/12).
  • Disconnect all external cables from the enclosure.
    Use extra forces to disconnect QSFP cables if they are connected to the solution.
  • A torque screwdriver is available for request if you do not have one at hand.

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

  • Remove protective covers from the GPU if they are installed.

    Figure 1. Protective covers removal
    Protective covers removal

Ensure you have “SD650 V2 or SD650-N V2 Neptune DWC Waterloop Service Kit “ in hand to install components.

Prepare the following screwdrivers to ensure you can install and remove corresponding screws properly.
Table 1. Torque screwdriver type list
Torque screwdriver type listScrew type
Torx T10 head screwdriverTorx T10 screw
Phillips #1 head screwdriver or 3/16" hex head screwdriverPhillips #1 screw
Phillips #2 head screwdriverPhillips #2 screw
The following illustration shows the GPU numbering.
Figure 2. GPU numbering
GPU numbering


  1. Gently place the GPU down on the GPU board; then, install the four Phillips #2 screws with a torque screwdriver sets to the proper torque.
    For reference, the torque required for the screws to be fully tightened/removed is 0.45-0.56 newton-meters, 4-5 inch-pounds.
    Figure 3. GPU installation
    GPU installation
  2. Apply the new thermal grease on GPUs.
    1. If there is any old thermal grease on four GPUs and the cold plates, gently clean the top of the four GPUs and the cold plates using an alcohol cleaning pad.
    2. If you have cleaned the top of the GPUs with an alcohol cleaning pad, make sure to apply the new thermal grease after the alcohol has fully evaporated.
    3. Apply gray thermal grease to the top of the four GPUs with a syringe by forming four dots spaced as shown below, with each dot consisting of about 0.5 gram (about 0.225 ml) of gray thermal grease. Each syringe contains 1 gram of thermal grease, sufficient for two dots of thermal grease.
    Figure 4. Thermal grease application
    Thermal grease application
  3. Replace the existing putty pad with the new one.
    Figure 5. Putty pad
    Putty pad
  4. Check the gap pads on the water loop, if any of them are damaged or missing, replace them with the new ones.
    Figure 6. Gap pads on the water loop
    Gap pads on the water loop
  5. Reinstall the water loop.
    1. ❶ Carefully rotate the top side of the water loop.
    2. ❷ Carefully insert the quick connect into the tray opening as shown.
    3. ❸ Carefully position the water loop on two guide pins near the rear of the node; then, gently put the water loop down and ensure it is firmly seated on the GPU board.
      Figure 7. Water loop installation
      Water loop installation
  6. Loosen all water loop carrier screws (15x Phillips #2 screws).
    Figure 8. Loosening water loop carrier screws
    Loosening water loop carrier screws
  7. Carefully lift the water loop carrier up and away from the water loop.
    Figure 9. Water loop carrier removal
    Water loop carrier removal
  8. Reinstall water loop screws (7x Torx T10 screws) with a torque screwdriver sets to the proper torque.
    For reference, the torque required for the screws to be fully tightened/removed is 0.5-0.6 newton-meters, 4.5-5.5 inch-pounds.
    Figure 10. Water loop screws installation
    Water loop screws installation
  9. Reinstall GPU cold plate screws (4x Phillips #1 screws per GPU cold plate, total of 16x Phillips #1 screws) with a torque screwdriver set to the proper torque. For reference, the torque required for the screws to be fully tightened/removed is 0.34-046 newton-meters, 3-4 inch-pounds.
    Figure 11. GPU cold plate screws installation
    GPU cold plate screws installation
    1. Push down the GPU cold plate with your palm to reduce the gap between the GPU cold plate and the GPU.
    2. Press the torque screwdriver against the screw so that the screw is engaged with the GPU.
    3. Follow the screw sequence specified on the GPU cold plate label, and fasten each screw for 720 degrees with a torque screwdriver set to the proper torque.
      For reference, the torque required for the screws to be fully tightened/removed is 0.46–0.34 newton-meters, 4–3 inch-pounds.

      GPU cold plate installation
    4. Make sure that the GPU cold plate is lowered into the node and its surface is flat without tilting. If the GPU cold plate is tilted, unfasten the screws, and repeat Step 1 to Step 3.
    5. Repeat Step 3 until the screws are fully tightened.
    6. Make sure the height of each screw is 12.5±0.3 millimeter (0.49±0.01 inch) and is fully compressed. If not, repeat the GPU cold plate installation steps.

      Height of each tightened screw
      Inspect the screws to make sure they are fully compressed.

      screw height inspection
  10. Reinstall the four Torx T10 screws (per node) to secure the quick connect.
    Figure 12. Screws installation
    Screws installation
  11. Reinstall the clamp plate or the drive depending on your configuration.
    • Clamp plate installation: Install the two screws to secure the clamp plate.

      Figure 13. Clamp plate installation
      Clamp plate installation
    • Drive installation: see Install the drive in the GPU node.

  12. Remove the connector cover if necessary.
    Figure 14. Connector cover removal
    Connector cover removal
  13. Connect GPU power cable.
    Figure 15. GPU power cable installation
    GPU power cable installation
  14. See Cable installation order to connect and route required cables accordingly.
After you finish
  1. Reinstall the front and the rear cross braces (14x Phillips #1 screws).

    Figure 16. Cross brace installation
    Cross brace installation
  2. Reinstall the tray cover (see Install the tray cover).

  3. Reinstall the tray (see Install a DWC tray in the enclosure).

    For safety, use the lift tool to install the tray into the rack.
  4. Connect all required external cables to the enclosure.
    Use extra forces to connect QSFP cables to the enclosure if Mellanox ConnectX-6 adapters are installed.
  5. Check the power LED on each node to make sure it changes from fast blink to slow blink to indicate all nodes are ready to be powered on.

Demo video

Watch the procedure on YouTube