Removing the graphics processing unit from a water-cooled 8335-GTB system

Learn how to remove and replace a graphics processing unit (GPU) in the water-cooled IBM® Power® System S822LC (8335-GTB) system.

1. Attach the electrostatic discharge (ESD) wrist strap.
   Attention:

   • Attach an electrostatic discharge (ESD) wrist strap to the front ESD jack, to the rear ESD jack, or to an unpainted metal surface of your hardware to prevent the electrostatic discharge from damaging your hardware.
   • When you use an ESD wrist strap, follow all electrical safety procedures. An ESD wrist strap is used for static control. It does not increase or decrease your risk of receiving electric shock when using or working on electrical equipment.
   • If you do not have an ESD wrist strap, just prior to removing the product from ESD packaging and installing or replacing hardware, touch an unpainted metal surface of the system for a minimum of 5 seconds.
2. If you are removing multiple GPUs, label the GPUs, noting their positions and orientations.
3. For the GPU you are removing, remove the cold plate. Refer to Figure 1.
   1. For the cold plate that you are removing, unlatch the service hook and rotate it into position.
      • For the cold plate in position C1, use service hook (A).
      • For the cold plate in position C4, use service hook (B).
      • For the cold plate in positions C7 and C9, use service hook (C).
      Figure 1. Cold plate service clips

      
   2. Loosen the cold plate retainer screw and swing the retainer open as shown in Figure 2.
      Attention: Do not unscrew the four spring-loaded screws that attach the aluminum heat cover to the GPU.
      Figure 2. Open the cold plate retainer

      
   3. Lift the cold plate (A) off the GPU that you are removing and attach the cold plate to the service hook (B) as shown in Figure 3.
      Figure 3. Remove the cold plate; attach to clip

      
4. For the GPU you are removing, remove the eight screws shown in Figure 4.
   Attention: Do not unscrew the four spring-loaded screws that attach the aluminum heat cover to the GPU.
   Figure 4. Remove eight GPU screws per GPU; do not loosen the four spring-loaded screws

   
5. Remove the GPU from the system backplane. Be careful of the pins on the bottom of the GPUs to avoid damaging the pins and the GPU. See Figure 5.
   Figure 5. Remove GPU