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System Overview 1-7
The 72-bit-wide, buffered EDO DIMMs support the ECC feature, which detects
memory errors and corrects single-bit memory errors. The ECC feature pro-
vides more reliable memory and less downtime, and is built into the memory
controller on the system board.
See “DIMMs” in Chapter 4 for information on removing and replacing DIMMs.
Advanced Expansion Subsystem
The computer system offers an advanced expansion subsystem that can support
a mixture of traditional EISA expansion cards, Plug and Play ISA expansion
cards, and PCI expansion cards. The EISA Configuration Utility, included with the
system, provides a means of avoiding resource conflicts that might arise from such
an arrangement.
After all legacy cards have been configured with the EISA Configuration Utility,
the system automatically assigns required memory space, IRQ lines, and DMA
channels to any installed Plug and Play ISA expansion cards and PCI expansion
cards the next time the system is rebooted. Chapter 5, “Using the EISA Config-
uration Utility,” in the Dell PowerEdge 4200 Systems User’s Guide describes the
EISA Configuration Utility and provides instructions for using it to configure the
system.
The eight expansion-card slots include three EISA expansion-card connectors
and five PCI expansion-card connectors. The expansion-card connectors are
located on the system board (see Figure 1-18).
Integrated Server Management
The system board contains integrated server management circuitry that moni-
tors critical system voltages and temperatures, as well as the operation and
speed of the system cooling fans. The integrated server management circuitry
works in conjunction with the Intel LANDesk
®
Server Management suite.
Video Controller
The video subsystem, built into the system board, is a high-speed, high-
resolution, VGA-compatible video subsystem connected to the PCI local bus.
The standard video subsystem contains 1 MB of DRAM memory (the video
memory size is not upgradable).
Maximum noninterlaced resolutions are 640 x 480 pixels with 16.7 million col-
ors, 800 x 600 pixels with 65,536 colors, and 1024 x 768 pixels with 256 colors.
Integrated SCSI Controllers
A built-in Adaptec 7880 Ultra/Wide SCSI controller provides an Ultra/Wide
Fast SCSI interface via a 68-pin connector on the system board. This SCSI con-
troller attaches to the PCI bus to provide a high-performance SCSI bus that
controls up to six SCSI hard-disk drives in the SCSI hard-disk drive bays.
In the standard Dell PowerEdge 4200 system configuration, the Ultra/Wide
SCSI host adapter on the system board controls the SCSI backplane board.
When used in combination with an optional PowerEdge Expandable RAID