NEC Express5800 series User Manual page 213

NOTES:
Maximum memory size: 8-GB
In the normal state, the CPU blade does not contain memory. The
memory is a required option.
Adding order and precautions
DIMMs must be populated in pairs.
Two DIMMs must be of the same capacity and same speed. (Check the labels on the
DIMM board.)
Install the first pair into slots #1 and #2, then the second pair in slots #3 and #4.
Installation
Install the DIMM on the CPU blade depending on the following procedure:
19.
Shutdown the CPU Blade that will be removed, and turn off the power of the CPU blade.
20.
Take the CPU blade out from the Blade Assembly Unit.
Refer to the User's Guide of the Blade Assembly Unit.
21.
Put the CPU blade on a clean anti-static sheet.
22.
Open the levers at both ends of the DIMM socket.
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