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#### CPU Module Features and Components

The CPU module for the Sun Fire X4640 server has a mechanical key located on the upper right side of the module. This key renders the module unique to the Sun Fire X4640 server, and prevents the module from being installed in Sun Fire X4600 and X4600 M2 servers, which use a similar type card. The CPU module for the X4640 server is not compatible with X4600 and X4600 M2 servers. Do not remove the mechanical key and attempt to install the module in a different model of server. Conversely, CPU modules for the X4600 and X4600 M2 servers are not compatible with the X4640 server. Do not attempt to install an X4600 and X4600 M2 CPU module in an X4640 server. The following illustration shows the features and components of the CPU module.

Legend
1 | DIMM slot DIMM 0
2 | DIMM slot DIMM 7
3 | CPU module fault LED
4 | DIMM fault LEDs (16)
5 | Mechanical key (Sun Fire X4640)
6 | Fault Remind switch
7 | Power connector

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