NEC EXPRESS5800/120Lf, User Manual

Page: 106 / 198

4-20 Upgrading Your System
DIMMs
The system board contains six DIMM sockets (Figure 4-18). Each socket can
hold a single 72-bit DIMM module with 128MB, 256MB, 512MB, or 1GB of
memory. When all six sockets are populated, the system board supports a
maximum of 6 GB of memory with 1GB DIMMs.
Memory is partitioned as three banks of SDRAM that must be populated in
pairs, each providing 72 bits of buffered two-way interleaved memory (64-bit
main memory plus ECC). DIMMs will always be installed in sockets 1 and 2.
When you install additional DIMMs, you must start with the first empty socket
next to the last DIMMs already installed. When you remove DIMMs, you must
start with the highest number occupied DIMM sockets on the system board.
Note:
DIMMs are always added in pairs in the
ascending order of DIMM socket numbers.
1A
1B
2A
2B
3A
3B
1A DIMM #1-A
1B DIMM #1-B
DIMM Group #1
2A DIMM #2-A
2B DIMM #2-B
DIMM Group #2
3A DIMM #3-A
3B DIMM #3-B
DIMM Group #3
Figure 4-18. DIMM Locations on the System Board