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power-supply
selector switch
AC power input connector
I/O panel
connectors
Figure 1-4. Back/Left Side Internal View
System Memory
System memory has a minimum of 32 MB of 72-bit-wide, buffered, EDO-type
memory. The system memory capacity can be expanded up to 512 MB by using
combinations of 32- and 128-MB buffered, EDO-type DIMMs.
The system board has four 168-pin DIMM sockets. The DIMMs do not have to
be inserted in pairs. The socket population rules are as follows:
•
Populate the DIMM sockets in order from DIMM_A (upper) to DIMM_D
(lower).
•
The DIMMs should be rated at 60 nanoseconds (ns) or faster. All of the sys-
tem memory operates at the speed of the slowest DIMM installed.
•
The largest-capacity DIMM should be in socket DIMM_A, with smaller-
capacity DIMMs installed in decreasing sizes toward socket DIMM_D.
The 72-bit-wide, buffered, EDO DIMMs support the ECC feature, which
detects memory errors and corrects single-bit memory errors. The ECC feature
provides more reliable memory and less downtime. The ECC feature is built
into the memory controller on the system board.
externally accessible
drive bays (3)
SCSI hard-disk
drive cage
SCSI cable
hard-disk-drive
power cables
system board
System Overview
1-5
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