That is the list of processors supported on the D945GCCR.
In your original post, you indicated that you had a replacement E3400. From that, I assumed you "replaced" one E3400 with another E3400.
If the processor (E3400) is not in the supported processor list, then it is not supported, even though it may physically fit the socket.
The D945GCCR is an old board, no longer supported: Support for the Intel® Desktop Board D945GCCR
If the Intel Bios for that board does not support the E3400, then attempting to use the E3400 is done so at your risk.
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