IBM BladeCenter QS20 Problem Determination And Service Manual page 70

Figure 13. Refitting the bezel to the blade
14. Remove the small metal cover on the front bezel from the slot where the
Figure 14. Removing the InfiniBand slot cover
15. Plug the PCI-Express cable into the BladeCenter QS20's PCI-Express
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BladeCenter QS20 Type 0200: Problem Determination and Service Guide
InfiniBand option was installed.
Note: If only one InfiniBand option is to be installed, it is recommended that
you install it in the upper slot.
connector closest to the InfiniBand card. Leave the other end unconnected.