Dell Precision 5820 Tower Owner's Manual

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PCIe slots

The PCIe slots on Precision 5820 have a different functionality depending on the processor installed. Core i7-78xx has a limit of 28 lanes.

This results in a reduced PCIe lane count to the slots 1 and 4 as shown in the following table:

Slot 1 is closest to CPU/memory complex.

Table 1. PCIe slotsThe following table shows PCIe slots lane:
	Core i9-79xx/Xeon	Core i7-78xx
Slot 1	PCIe x850W	Nonfunctional
Slot 2	PCIex16 300 W*	PCIex16 300 W
Slot 3	PCIex125W-PCH	PCIex1 25W-PCH
Slot 4	PCIex16 300 W*	PCIex8 150 W
Slot 5	PCIex4 25W-PCH	PCIex4 25W-PCH
Slot 6	PCI 32 bit 25 W	PCI 32 bit 25 W

NOTE:All slots are Gen3(8GTs) from processor root hub unless otherwise indicated xX indicates the number of lanes that are connected to the slot. FH=Full Height, FL=Full Length, DW=Double Wide as defined by PCIe CEM spec *Slots are 300 W capable. Limited to 250 W per slot when more than one MEGA is installed.