Dell PowerEdge 1750 Service Manual download pdf (Page 24)

Inside the System

In Figure4-3, the system covers are open and the bezel is removed to provide an interior view of the system.

Figure 4-3.InsidetheSystem



The system board can accommodate one or two microprocessors. The PCI riser board assembly accommodates up to two PCI expansion cards. Up to four

memory modules may be installed on the system board.

The hard-drive bays provide space for up to three 1-inch SCSI hard drives. SCSI hard drives are connected to a SCSI controller on the system board through

the SCSI backplane board.

The peripheral bays provide space for an optional 3.5-inch diskette drive and a CD drive.

The power distribution board (PDB) provides hot-plug logic and power distribution for the system. Two hot-pluggable, redundant power supplies provide

power to the system board and internal peripherals.



Duringaninstallationortroubleshootingprocedure,youmayberequiredtochangeajumper.Forinformationaboutthesystemboardjumpers,see"Jumpers

and Connectors."

Expansion Cards

Up to two half-length, PCI-X expansion cards can be installed in the system, one on each side of the riser board assembly. See Figure4-4. The riser board

assembly consists of two riser boards permanently attached to each other with plastic standoffs. It plugs into twin riser connectors on the system board and

is considered an extension of the system board. See Figure5-3.

ThePCIslotlocationsaremarkedonthesystemboardasPCI1andPCI2.ThePCI1connectorontheriserboardassemblyishigherthanthePCI2

connector,becausethePCI1cardinstallsabovetheoptionalROMBcard.

Two different PCI card configurations are available:

l Two PCI-X, 64-bit, 133-MHz, 3.3-V expansion cards

l One PCI-X, 64-bit, 133-MHz, 3.3-VexpansioncardinPCI2,andonePCI,64-bit, 33-MHz, 5-VexpansioncardinPCI1.

Figure 4-4.Riser-Board Expansion-Card Connectors



NOTICE: If you purchased a system with redundant power supplies, you must connect both power cables to the system; otherwise, the fans operate

at the maximum RPM, which increases the fan noise. To ensure redundancy, connect the power cables to two different electrical power sources.

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Dell PowerEdge 1750 Service Manual Page 24

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