Processor and heat sink replacement
Use the following procedures to replace an assembled processor and heat sink, known as a processor-heat-
sink module (PHM), a processor, or a heat sink.
Attention: Before you begin replacing a processor, make sure that you have an alcohol cleaning pad (part
number 00MP352) and blue thermal grease (part number 01KP765). Do not use gray thermal grease (part
number 41Y9292) when replacing a ThinkSystem SN550 processor.
S012
CAUTION:
Hot surface nearby.
Important: The processor in your compute node can throttle in response to thermal conditions, temporarily
lowering its speed to reduce heat output. In instances where a few processor cores are throttled for an
extremely short time period (100 ms or less), the only indication might be an entry in the operating system
event log with no corresponding entry in the system XCC event log. If this situation occurs, the event can be
ignored and processor replacement is not required.
Remove a processor and heat sink
This task has instructions for removing an assembled processor and heat sink, known as a processor-heat-
sink module (PHM), a processor, and a heat sink. All of these tasks require a Torx T30 driver.
Attention:
• Each processor socket must always contain a cover or a PHM. When removing or installing a PHM,
protect empty processor sockets with a cover.
• Do not touch the processor socket or processor contacts. Processor-socket contacts are very fragile and
easily damaged. Contaminants on the processor contacts, such as oil from your skin, can cause
connection failures.
• Remove and install only one PHM at a time. If the system board supports multiple processors, install the
PHMs starting with the first processor socket.
• Do not allow the thermal grease on the processor or heat sink to come in contact with anything. Contact
with any surface can compromise the thermal grease, rendering it ineffective. Thermal grease can damage
components, such as electrical connectors in the processor socket. Do not remove the grease cover from
a heat sink until you are instructed to do so.
Before you remove a PHM:
Note: The heat sink, processor, and processor retainer for your system might be different than those shown
in the illustrations.
1. Read “Safety” on page iii and “Installation Guidelines” on page 21 to ensure that you work safely.
2. Power off the corresponding compute node that you are going to perform the task on.
3. Remove the compute node from the chassis (see “Remove the compute node from the chassis” on page
24).
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ThinkSystem SN550 Compute Node Maintenance Manual
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