Dell EMC PowerEdge R840 Installation and Service Manual

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Expansion cards and expansion card risers

An expansion card in the system is an add-on card that can be installed into an expansion slot on the system board or a slot on a riser to add enhanced functionality to the system through the expansion bus.

NOTE A System Event Log (SEL) event is logged if an expansion card riser is not supported or missing. It does not prevent your system from turning on. However, if a F1/F2 pause occurs, an error message is displayed.
Table 1. Expansion card riser specificationsThis table describes the expansion card riser specifications.
PCIe slot Riser Processor connection Height Length Slot width
1 X8 PCIe Riser 1 Processor 1 Full height Half length x8
2 X16 PCIe Riser 1 Processor 1 Full height Full length x16
X8 PCIe Riser 1 Processor 1 Full height Half length x8
3 Located on the system board Processor 1 Low profile Half length x16
4 Located on the system board Processor 2 Low profile Half length x16
5 X8 PCIe Riser 2 Processor 2 Full height Half length x8
6 X16 PCIe Riser 2 Processor 2 Full height Full length x16
X8 PCIe Riser 2 Processor 2 Full height Half length x8

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