Remove the GB200-NVL4 board

Use this information to remove the GB200-NVL4 board.

Procedure

1. Make preparations for this task.
   1. Remove the tray from the enclosure. See Remove a tray from the enclosure.
   2. Remove the tray cover. See Remove the tray cover.
   3. Remove the cross bar. See Remove the cross bar.
   4. Remove the rear wall. See Remove the rear wall.
   5. Remove the NVLink bridge. See Remove the NVLink interposer board.
   6. (Left-side GB200-NVL4 board only) Remove the HMC module. See Remove the HMC module.
   7. Disconnect all the cables from the GB200-NVL4 board, CX8 mezzanine module, and MCIO breakout board. See Internal cable routing.
   8. Remove the CX8 mezzanine module. See Remove a CX8 mezzanine module.
   9. Remove the MCIO breakout board. See Remove the MCIO breakout board.
2. There are two P12V middle bus bars in the tray, the right-side bus bar and the left-side bus bar. Decide which bus bar is to be removed, and remove and loosen screws according to the table and illustration below.
   Attention

   • When removing the right-side GB200-NVL4 board: remove the right-side bus bar.

   • When removing the left-side GB200-NVL4 board: remove the right-side bus bar; then, remove the left-side bus bar.

   1 Right-side bus bar: 1a Remove two (2x) PH1 screws 1b Loosen four (4x) T15 thumb screws

   2 Left-side bus bar: 2a Remove one (1x) PH1 screws 2b Loosen four (4x) T15 thumb screws

   Figure 1. Removing and loosening screws on the P12V middle bus bars
   
   

   Figure 2. Removing and loosening screws on the right-side bus bar
   
   

   Figure 3. Removing and loosening screws on the left-side bus bar
   
   
3. Remove the eight (8x) screws from the P12V front bus bars.
   Figure 4. Removing P12V front bus bar screws
   
   
4. Remove the bus bar from the GB200-NVL4 board to be removed.
   Attention

   • When removing the right-side GB200-NVL4 board: remove the right-side bus bar.

   • When removing the left-side GB200-NVL4 board: remove the right-side bus bar; then, remove the left-side bus bar.

   Figure 5. Removing the right-side bus bar
   
   

   Figure 6. Removing the left-side bus bar
   
   
5. Install the cross bar to the front of the tray.
   1. Align the cross bar with the screw holes on the tray side walls; then, install it to the tray.
   2. Install four (4x) screws to secure the cross bar to the tray.
   Figure 7. Installing cross bar to front of the tray
   
   
6. Remove the conduction plate from the GPU cold plate on top of the GB200-NVL4 board to be removed.
   1. Remove three screws from the conduction plate.
   2. Remove the conduction plate from the GPU cold plate on top of the GB200-NVL4 board to be removed.
   Figure 8. Removing conduction plates from GPU cold plates (MCIO breakout board configuration)

   Figure 9. Removing conduction plates from GPU cold plates (Dual CX8 mezzanine module configuration)
   
   
7. Using an alcohol cleaning pad, gently clean off the putty pads from the bottom side of the conduction plate and from the GPU cold plate.
   Figure 10. Conduction plate for GPU cold plate

   • 1 Conduction plate for MCIO breakout board configuration
   • 2 Conduction plate for Dual CX8 mezzanine module configuration

   
   
   

   Figure 11. Cleaning putty pads from GPU cold plates (MCIO breakout board configuration)
   
   

   Figure 12. Cleaning putty pads from GPU cold plates (Dual CX8 mezzanine module configuration)
   
   
8. Install the GPU cold plate handle to the GB200-NVL4 board to be removed.
   Figure 13. Installing GPU cold plate handle to the water loop
   
   
9. Fasten eight (8x) thumbscrews to install the GPU cold plate handle. Make sure to follow the sequence shown in the illustration below.
   Figure 14. Fastening GPU cold plate handle screws
   
   
10. Lock the retaining thumbscrew on the GPU cold plate handle.
    1. Loosen the nut.
    2. Remove the nut and the washer from the GPU cold plate.
    3. Push the screw into the slot
    4. Re-install the nut and washer back to the GPU cold plate.
    5. Fasten the nut to the screw to secure handle to the GPU cold plate.
       Figure 15. Locking the retaining thumb screw
       
       
11. Install the T15 extension bit to the torque screwdriver; then, loosen twenty-one (21x) T15 thumbscrews to release the GPU cold plate from the GB200-NVL4 board. Make sure to follow the sequence shown in the illustration below.

    • Screw 16, 17, 18, 19, 20, 21 are ONLY for Dual CX8 mezzanine module configuration. Fasten/loosen fifteen (15x) screws for MCIO breakout board.

    • Installing the T15 extension bit to the torque screwdriver before loosening the screws.

      Figure 16. T15 extension bit
      
      

    Figure 17. Loosening GPU cold plate screws
    
    
12. Install the GPU cold plate to the cross bar.
    1. Flip the GPU cold plate and place it on the cross bar.
    2. Fasten two (2x) PH2 thumb screws to secure the GPU cold plate to the cross bar.
    Figure 18. Install right-side GPU cold plate to the cross bar
    
    

    Figure 19. Install left-side GPU cold plate to the cross bar
    
    
13. Using an alcohol cleaning pad, gently clean the PCM and putty pads on the GB200-NVL4 board that was not being replaced.
    Figure 20. PCM and putty pads on the GB200-NVL4 board
    
    

    1 Only for Dual CX8 Mezzanine Module configuration

14. Loosen five (5x) T10 thumb screws from the GB200-NVL4 board to be removed.
    Figure 21. Loosen five screws from the right-side or left-side GB200-NVL4 board
    
    
15. Install the handles on the GB200-NVL4 board.
    1. Loosen the two handles that are stored in handle sockets in corner of the tray.
    2. Lift up the two handles.
       Figure 22. Lifting the two handles from the tray
       
       
    3. Install the two handles to the handle sockets on the GB200-NVL4 board, as shown in the illustration below.
    4. Fasten the handles to secure them to the board.
       Figure 23. Installing the handles to the GB200-NVL4 board
       
       
16. Hold the handles and remove the GB200-NVL4 board from the tray.
    Figure 24. Removing the GB200-NVL4 board
    
    
17. Remove the two handles.
    1. Loosen the two handles.
    2. Lift up the handles from the GB200-NVL4 board.
       Figure 25. Removing handles from GB200-NVL4 board
       
       
18. Return the handles to handle slots in the tray.
    1. Install the handles to the handle slots in the corner of the tray.
    2. Fasten the handles to secure them to the tray.
    Figure 26. Installing the handles to the slots in tray