IBM IntelliStation M Pro 6225 Hardware Maintenance Manual And Troubleshooting Manual page 82

To replace the microprocessor and heat sink, reverse the previous steps.
Note: To maintain proper orientation between the microprocessor and the
Microprocessor
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IntelliStation M Pro Types 6225 and 6228: Hardware Maintenance Manual and Troubleshooting Guide
microprocessor socket during installation, observe the following:
v The microprocessor has two notches that are keyed to two tabs on the
sides of the socket.
v A triangle-shaped indicator on one corner of the microprocessor points to
a 45-degree angle on one corner of the socket.
Orientation
notches
Orientation
indicator