HP (Hewlett-Packard) D3J88UT#ABA ユーザーズマニュアル

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HP Z420 Workstation system board architecture 
Figure 1-15
  HP Z420 Workstation system board block diagram
NOTE:
The PCIe designators indicate the mechanical connector size and number of electrical PCIe
lanes routed to an expansion slot. For example, x16(8) means that the expansion slot is mechanically a
x16 length connector, with 8 PCIe lanes supported.
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Chapter 1   Hardware overview