Hitachi CB 520H B1 Service Manual page 235

2 While unlocking the adapter stopper, push in the GPU adapter into the
.
card adapter F/H.
3 Slide in the optional power cable connector into the PCI blade card
.
adapter F/H, and then push in the connector into the GPGPU.
4 While holding the two portions marked with white circle, align the
.
connector guide hole of the adapter F/H with the guide pin on the main
board, and then press the portion marked PRESS HERE.
5 Push in the PCI blade optional power cable connector into the main board.
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Hitachi Compute Blade 500 Series System Service Manual
Replacing parts
5-83