IBM Xseries 345 8670 Maintenance Manual page 71

v To prevent damage to server components when you install a microprocessor, be
sure to install only a microprocessor with the proper front-side bus speed.
400 MHz front-side bus
microprocessor
– If your server supports a 400 MHz front-side bus, install only a microprocessor
with one pin missing from one corner and two pins missing form an adjacent
corner. If your server supports a 400 MHz front-side bus, the heat-sink
retention mechanism surrounding the microprocessor connector is metallic
gray.
– If your server supports a 533 MHz front-side bus, install only a microprocessor
with one pin missing from each of two adjacent corners. If your server
supports a 533 MHz front-side bus, the heat-sink retention mechanism
surrounding the microprocessor connector is black.
Notes:
1. To order additional microprocessor options, contact your IBM reseller or IBM
marketing representative.
2. When you install the microprocessor in socket J6, you must also install the
voltage regulator module (VRM) that comes with the microprocessor in VRM
connector J5.
Note: All installed VRMs must be of the same type. Mixing different VRMs will
result in a mismatch error.
3. The microprocessor speeds are automatically set for this server; therefore, you
do not need to set any microprocessor frequency-selection jumpers or switches.
The following illustration is a simplified layout of the microprocessor connector
locations and other microprocessor-related components on the system board.
533 MHz front-side bus
microprocessor
Chapter 4. Customer replaceable units
61