NEC Express5800/120Rf-1, User Manual

Page: 309 / 408

Upgrading Your Server 9-23
Installation Order
DIMMs must be populated in pairs and in the following order:
#7 and #8, #5 and #6, #3 and #4, then #1 and #2.
Install DIMMs starting from the one having smallest capacity.
IMPORTANT:
Install two additional DIMMs for each group
*1
because the server uses interleaved memory. If DIMMs of different
specifications
*2 are installed in a bank, the server does not operate
normally.
*1 A group is a unit of two DIMM slots. Each pair of DIMM slots
#1 and #2 (group #1), #3 and #4 (group #2), #5 and #6 (group
#3), and #7 and #8 (group #4) in the figure is a group. (The
symbols are also printed on the mother board.)
*2 DIMM specification is shown on the label attached to the
DIMM as follows:
Example: Frequency of 400 MHz, buffered, capacity of 512 MB,
row address of 12 bits, column address of 10 bits, and
single side
400 / B / 512 / R12 C10 S
Single side
Column address
Row address
Capacity
Buffered
Frequency
Mother board
DIMM #1
DIMM #2
DIMM #3
DIMM #4
DIMM #5
DIMM #6
DIMM #7
DIMM #8
Group #1
Group #2
Group #3
Group #4
REAR FRONT