Dimm Mounting Rule - NEC Express 5800 User Manual

Hardware

DIMM Mounting Rule

A1080a-S/A1080a-D/A1040a Model
 A pair of DIMMs is defined as "PAIR" in this Guide, which is connected from the same channel
(Ch.x) number in two memory buffers connected to the same memory controller.
Example) DIMM #1 and DIMM #2 are regarded as PAIR #1, which are connected from
 The exact same type of DIMMs (Column/Row/Bank/Rank configuration) must be mounted on
the same PAIR.
 In the A1080a-S/A1080a-D/A1040a model configuration, "PAIR" indicating pairs of DIMM is
the basic unit of DIMM control. DIMMs are added or reduced by using this PAIR unit.
 Add in pairs starting from PAIR #1 in the order of lowest to highest number as a rule when
adding DIMMs.
Memory Configuration Diagram
PAIR #1
PAIR #3
PAIR #5
PAIR #7
Ch.1 of the memory buffer #1 and Ch.1 of the memory buffer #2 in the following
memory configuration diagram.
#1
DIMM
#5 DIMM #6
DIMM
DIMM #9
DIMM #13 DIMM #14
Ch.1
Ch.0 Ch.0
Memory
Buffer#1 Buffer#2
A
Ch.
Memory Controller#1
PAIR #2
#2
DIMM
PAIR #4
PAIR #6
#10
DIMM
PAIR #8
Ch.1
Memory
B
Ch.
Processor
88
#3
DIMM
DIMM
#7 #8
DIMM DIMM
#11
DIMM
DIMM
DIMM #15 DIMM #16
Ch.1 Ch.0 Ch.1
Ch.0
Memory
Memory
Buffer#3
Buffer#4
C
Ch.
Memory Controller #2
#4
#12
Ch.D