NEC Express5800 series User Manual page 161

DIMM Installation Order
Install two DIMMs in ascending order of paired-slot numbers.
DIMM 3B
DIMM 2B
DIMM 1B
DIMM 3A
DIMM 2A
DIMM 1A
REAR
IMPORTANT:
the server uses interleaved memory. If DIMMs of different
specifications (*2) are installed in a BANK, the server may not operate
normally.
*1 A BANK is a unit of two DIMM slots. Each pair of DIMM slots
#1A and 1#B (DIMM group #1), #2A and #2B (DIMM group #2 ),
and #3A and #3B (DIMM group #3) in the figure is a BANK. (The
symbols are also printed on the system board.)
*2 DIMM specification is shown on the label attached to the DIMM as
follows:
System board
Install two additional DIMMs for each BANK (*1) as
Example: Frequency of 133 MHz, buffered, capacity of 128 MB,
raw address of 12 bits, column address of 10 bits, and
single side
133 / B / 128 / R12 C10 S
Column address
Raw address
Capacity
Buffered
Frequency
FRONT
Single side
Upgrading Your NEC Storage 151