Dimms - NEC EXPRESS5800/140Hb Service Manual

DIMMs

The memory board contains sixteen DIMM sockets arranged in four groups (see
Figure 4-16) of 4 way interleaved memory. Each 168-pin socket can hold a
single 72-bit DIMM module with 64MB, 128MB, 256MB, 512MB, or 1GB
(when available) of memory. When all sixteen sockets are populated, the
memory board supports a maximum of 16GB of memory with 1GB DIMMs.
DIMMs must be identical within a group on each board.
Note
four DIMMs) that is designated as one memory group.
DIMMs must also be of the same type and capacity within a
group.
The first group of DIMMs should be installed in DIMM slots 1, 5, 9 and 13 (see
Figure 4-16, Group #1). When you install additional DIMMs, you must start
with Group #2 and continue to Group #4. When you remove DIMMs; you must
start with the highest populated group of DIMMs.
The following subsections describe the procedures for adding memory DIMMs
to your system.
If the system was running, any processor and heat sink
installed is hot. To avoid the possibility of a burn while
configuring memory, let the components cool for 10 minutes
before continuing with the procedures described here.
Note: DIMMs are grouped into four and must be installed in multiples of four.
: DIMMs must be installed in a group (consisting of
! WARNING
A Group #1 DIMM sockets (DIMM slots 1, 5, 9, 13)
B
Group #2 DIMM sockets (DIMM slots 2, 6, 10, 14)
C
Group #3 DIMM sockets (DIMM slots 3, 7, 11, 15)
D
Group #4 DIMM sockets (DIMM slots 4, 8, 12, 16)
E System board connector
Figure 4-16 Memory Board DIMM Locations
Disassembly and Reassembly 4-21