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HP Z420 Workstation slot identification and description
Maximum power used by all slots must not exceed total system power and is subject to configuration
limitations.
Figure 3-3 Identifying expansion card slots
Table 3-5 PCI slots
Slot Type Mechanical compatibility Electrical compatibility
1PCIe2 x4 (1) x4 x1
2 PCIe3 - x16 x16 x16
3PCIe2 - x8 (4) x8 x4
4 PCIe3 x8 x8 x8
5PCIe3 x16 x16 x16
6 PCI 32/33 PCI PCI
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.
Slot two is the primary graphics slot; slot five is the secondary graphics slot.
Slots one, three, and four use open-ended PCIe connectors, so a PCIe x16 card can be inserted.
Graphics cards greater than 75 watts require the use of an auxiliary power cable adapter.
88 Chapter 3 Component Replacement Information and Guidelines