DIMM connectors 1 and 3. However, the size, speed, type, and technology of the
DIMMs that you install in DIMM connectors 2 and 4 must match each other.
v Install only double-data-rate II (DDR II), PC2-5300, unbuffered synchronous
dynamic random-access memory (SDRAM) with error correcting code (ECC)
DIMMs. These DIMMs must be compatible with the latest PC2-5300 SDRAM
unbuffered DIMM specification.
v If you install a pair of 2 GB DIMMs and a pair of other-size DIMMs, the 2 GB
DIMMs must be installed as the first pair (in DIMM connectors 1 and 3).
v When you restart the server after you add or remove a DIMM, a message is
displayed indicating that the memory configuration has changed.
To install a DIMM, complete the following steps:
1. Read the safety information that begins on page v and “Installation guidelines”
on page 7.
2. Turn off the server and peripheral devices, and disconnect the power cord and
all external cables. Remove the cover.
Attention: To avoid breaking the retaining clips or damaging the DIMM
connectors, open, and close the clips gently.
3. Open the retaining clip on each end of the DIMM connector.
4. Touch the static-protective package that contains the DIMM to any unpainted
metal surface on the outside of the server. Then, remove the DIMM from the
package.
5. Turn the DIMM so that the keys align correctly with the slot.
6. Insert the DIMM into the connector by aligning the edges of the DIMM with the
slots at each end of the DIMM connector. Firmly press the DIMM straight down
into the connector by applying pressure on both ends of the DIMM
simultaneously. The retaining clips snap into the locked position when the DIMM
is firmly seated in the connector. If there is a gap between the DIMM and the
retaining clips, the DIMM has not been correctly inserted; open the retaining
clips, remove the DIMM, and then reinsert it.
If you have other devices to install, do so now. Otherwise, go to “Completing the
installation” on page 18.
10 IBM System x3250 Types 4364 and 4365: Installation Guide