NEC Express 5800/140Rb-4, Service Manual

Page: 61 / 145

Memory
This section includes instructions for removing and installing DIMMs on the memory board. For a
list of supported memory, call your service representative.
Installing DIMMs
CAUTION
Use extreme care when installing a DIMM. Applying too much pressure can
damage the socket. Keyed DIMMs insert only one way.
✏
NOTE
Load the DIMMs in the following order (Figure 23).
1. Bank 1: DIMMs #1, 2, 3, and 4
2. Bank 2: DIMMs #5, 6, 7, and 8
3. Bank 3: DIMMs #9, 10, 11, and 12
Always fill banks completely. Partially filled banks are ignored by the system.
Use only approved DIMMs listed on the NEC customer support Web site:
IMPORTANT: Install four additional DIMMs for each group because the server uses interleaved
memory. If DIMMs of different specifications* are installed in a group, the server does not operate
normally.
* DIMM specification is shown on the label attached to the DIMM as follows:
Example: Frequency of 200 MHz, buffered, capacity of 128 MB, raw address of 12 bits, column
address of 10 bits, and
single side
200 / B / 128 / R12 C10 S
Single side
Column address
Raw address
Capacity
Buffered
Frequency
Installing and Removing Components 53