NEC Express5800/A1080a, User Manual, Page: 101 / 696

Hardware
101
DIMM Mounting Rule in the System

Mount a larger DIMM preferentially on the slot with a lower number.

Mount on sets (pair of DIMMs for A1080a-S/A1080a-D and set of 4 DIMMs for A1080a-E ) in
the order of mounting the processor memory modules when mounting multiple memories.
DIMM Mounting Rule in Processor Memory Module
Follow the table below to mount DIMMs to the processor memory module.
The order of mounting DIMMs the processor memory module.
 For A1080a-S/A1080a-D Model (Set of 2 DIMMs as a pair)
DIMM PAIR
First Mount SLOT DIMM #1,#2 PAIR #1
Second Mount SLOT DIMM #3,#4 PAIR #2
Third Mount SLOT DIMM #5,#6 PAIR #3
Fourth Mount SLOT DIMM #7,#8 PAIR #4
Fifth Mount SLOT DIMM #9,#10 PAIR #5
Sixth Mount SLOT DIMM #11,#12 PAIR #6
Seventh Mount SLOT DIMM #13,#14 PAIR #7
Eighth Mount SLOT DIMM #15,#16 PAIR #8
 For A1080a-E Model (Set of 4 DIMMs as a pair)
DIMM PAIR
First Mount SLOT DIMM #1,#2,#3,#4 PAIR#1,#2
Second Mount SLOT DIMM #5,#6,#7,#8 PAIR#3,#4
Third Mount SLOT DIMM #9,#10,#11,#12 PAIR#5,#6
Fourth Mount SLOT DIMM #13,#14,#15,#16 PAIR#7,#8
NOTE:
(Example) For mounting 4-processor memory module of A1080a-S model,
the first 2 DIMMS are mounted to processor memory module 1,
the next 2 DIMMS are mounted to processor memory module 2,
the third 2 DIMMS are mounted to processor memory module 3,
the forth 2 DIMMS are mounted to processor memory module 4, and
the fifth 2 DIMMS are mounted to processor memory module 1…etc.