Attention:
v A startup (boot) microprocessor must always be installed in microprocessor
connector 1 on the system board.
v To ensure correct server operation, use microprocessors that have the same
cache size and type, front-side bus frequency, and clock speed. Microprocessor
internal and external clock frequencies must be identical.
v If you are installing a microprocessor that has been removed, make sure that it is
paired with its original heat sink or a new replacement heat sink. Do not reuse a
heat sink from another microprocessor; the thermal grease distribution might be
different and might affect conductivity.
v If you are installing a new heat sink, peel off the protective backing from the
thermal material that is on the underside of the new heat sink.
v If you are installing a new heat sink assembly that did not come with thermal
grease, see “Thermal grease” on page 89 for instructions.for applying thermal
grease; then, continue with step 1 of this procedure.
v If you are installing a heat sink that has contaminated thermal grease, see
“Thermal grease” on page 89 for instructions for replacing the thermal grease;
then, continue with step 1 of this procedure.
To install a microprocessor, complete the following steps:
1. Read the safety information that begins on page vii and “Installation guidelines”
on page 39.
Microprocessor
Alignment
marks
Microprocessor
socket dust cover
Microprocessor
release lever
2. Align the microprocessor with the socket (note the alignment mark and the
position of the notches); then, carefully place the microprocessor on the socket
and close the microprocessor bracket frame.
Attention: Do not use excessive force when inserting the microprocessor into
the socket.
Note: The microprocessor fits only one way on the socket.
3. Carefully close the release lever to secure the microprocessor in the socket.
88 IBM System x3550 Type 7978 and 1913: Problem Determination and Service Guide
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