Install the GPU board
Use this information to install the GPU board.
About this task
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.
- Turn off the corresponding DWC tray that you are going to perform the task on.NoteIf 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).
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.
- Hold the long sides of the GPU board with two hands while removing the new GPU board from the package box.Figure 1. Removing GPU board from the package box
Once the GPU board is removed from the plastic protective bag, hold two handles with both hands to move the GPU board.Figure 2. Removing GPU board from the package box
Ensure you have “SD650 V2 or SD650-N V2 Neptune DWC Waterloop Service Kit “ in hand to install components.
|Torque screwdriver type list||Screw type|
|Torx T10 head screwdriver||Torx T10 screw|
|Phillips #1 head screwdriver or 3/16" hex head screwdriver||Phillips #1 screw|
|Phillips #2 head screwdriver||Phillips #2 screw|
- Gently place the GPU board down and install the five Phillips #1 screws with a torque screwdriver sets to the proper torque. Note
Figure 4. GPU board installation
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.
When you install the GPU board from the node, avoid touching the connectors on the GPU board. Be careful not to damage any surrounding components inside the node.
- Install the two Torx T10 screws with a torque screwdriver sets to the proper torque.NoteFigure 5. Screws installation
- Reinstall the retimer board (see Install the retimer board).
- Apply the new thermal grease on GPUs.
Figure 6. Thermal grease application
- 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.
- 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.
- 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.
- Replace the existing putty pad with the new one.Figure 7. Putty pad
- Check the gap pads on the water loop, if any of them are damaged or missing, replace them with the new ones.Figure 8. Gap pads on the water loop
- Reinstall the water loop.
- ❶ Carefully rotate the top side of the water loop.
- ❷ Carefully insert the quick connect into the tray opening as shown.
- ❸ Carefully align the water loop with eight guide pins on four GPU cold plates; then, gently put the water loop down and ensure it is firmly seated on the GPU board.Figure 9. Water loop installation
- Loosen all water loop carrier screws (15x Phillips #2 screws).Figure 10. Loosening water loop carrier screws
- Carefully lift the water loop carrier up and away from the water loop.Figure 11. Water loop carrier removal
- Reinstall water loop screws (7x Torx T10 screws) with a torque screwdriver sets to the proper torque.NoteFigure 12. Water loop screws installation
- 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 13. GPU cold plate screws installation
- Push down the GPU cold plate with your palm to reduce the gap between the GPU cold plate and the GPU.
- Press the torque screwdriver against the screw so that the screw is engaged with the GPU.
- 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.NoteFor reference, the torque required for the screws to be fully tightened/removed is 0.46–0.34 newton-meters, 4–3 inch-pounds.
- 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.
- Repeat Step 3 until the screws are fully tightened.
- 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.NoteInspect the screws to make sure they are fully compressed.
- Reinstall the four Torx T10 screws (per node) to secure the quick connect.Figure 14. Screws installation
- Reinstall the clamp plate or the drive depending on your configuration.
Clamp plate installation: Install the two screws to secure the clamp plate.Figure 15. Clamp plate installation
Drive installation: see Install the drive in the GPU node.
- Remove the connector cover if necessary.Figure 16. Connector cover removal
- Connect GPU power cable.Figure 17. GPU power cable installation
- See Cable installation order to connect and route required cables accordingly.
Reinstall the front and the rear cross braces (14x Phillips #1 screws).Figure 18. Cross brace installation
Reinstall the tray cover (see Install the tray cover).
Reinstall the tray (see Install a DWC tray in the enclosure).NoteFor safety, use the lift tool to install the tray into the rack.
- Connect all required external cables to the enclosure.NoteUse extra forces to connect QSFP cables to the enclosure if Mellanox ConnectX-6 adapters are installed.
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.
Update the Universally Unique Identifier (UUID) and DMI/SMBIOS data with new vital product data (VPD). Use the Lenovo XClarity Provisioning Manager to update the UUID and DMI/SMBIOS data. See Update the Universal Unique Identifier (UUID) and Update the asset tag.
Enable TPM/TCM. See Enable TPM/TCM
Optionally, enable Secure Boot.