Cisco Systems UCS C420 manual Electrical Card Length1, NCSI3 Support

Chapter 3 Maintaining the Server

					Installing or Replacing Server Components
Table 3-6	PCIe Expansion Slots
	Electrical		Card Length1	Card Height 2		NCSI3 Support
Slot Number	Lane Width	Connector Length
1 (on riser)	Gen-3 x16	x16 connector	½ length	Full height		Yes
2	Gen-3 x8	x8 connector	½ length	½ height		No
3	Gen-3 x8	x8 connector	½ length	½ height		No
4	Gen-3 x8	x16 connector	½ length	½ height		Yes
5	Gen-3 x8	x8 connector	½ length	½ height		No
6	Gen-3 x8	x8 connector	½ length	½ height		No
7 (on riser)	Gen-3 x16	x16 connector	½ length	Full height		Yes

1.This is the supported length because of internal clearance.

2.This is the size of the rear panel opening.

3.NCSI = Network Communications Services Interface protocol. An NCSI slot is powered even when the server is in standby power mode.

PCIe Configuration Guide

For the best performance, we recommend that you populate the PCIe slots in the order shown in Table 3-7for each type of add-on card. For each card type, populate the primary slot first, followed by the secondary slot, and then any alternate slots. See Figure 3-23for the slot locations.

Table 3-7	PCIe Slot Population
PCIe Card Type		Primary Slot	Secondary Slot	Alternate Slots
RAID controller		Slot 3	Slot 5	—
Low-profile (half-height) network		Slot 2	Slot 6	Slots 1, 4, 5, or 71
adapter
Cisco UCS Virtual Interface Card		Slot 4	Slot 1 or 7	—

1. To use a half-height card in slots 1 or 7, you must have a full-height rear panel attached to the card.

Replacing a PCIe Card in a Riser Slot

Note If you are installing a Cisco UCS Virtual Interface Card (VIC), see Special Considerations for Cisco UCS Virtual Interface Cards, page 3-45.

To install or replace a PCIe card in full-height slots 1 or 7 on the PCIe risers, follow these steps:

Step 1 Remove a PCIe card (or a blank filler panel) from the PCIe riser assembly:

a.Shut down and power off the server as described in Shutting Down and Powering Off the Server, page 3-8.

b.Slide the server out the front of the rack far enough so that you can remove the top cover. You might have to detach cables from the rear panel to provide clearance.

Caution If you cannot safely view and access the component, remove the server from the rack.

	Cisco UCS C420 Server Installation and Service Guide
OL-27640-01		3-41