I.1800C [I.1800C]
Explanation: A cache type mismatch has been detected for one or more processor packages. Processors have one or
more cache levels with mismatched type
Severity: Error
User response: Complete the following steps:
1. Verify that matching processors are installed in the correct processor sockets. Correct any mismatch found.
2. Check the IBM support site for an applicable service bulletin or firmware update that applies to this processor
error.
3. (Trained technician only)Replace the system board
I.1800D [I.1800D]
Explanation: A cache associativity mismatch has been detected for one or more processor packages. Processors have
one or more cache levels with mismatched associativity
Severity: Error
User response: Complete the following steps:
1. Verify that matching processors are installed in the correct processor sockets. Correct any mismatch found.
2. Check the IBM support site for an applicable service bulletin or firmware update that applies to this processor
error.
3. (Trained technician only)Replace the system board
I.1800E [I.1800E]
Explanation: A processor model mismatch has been detected for one or more processor packages. Processors have
mismatched Model Number
Severity: Error
User response: Complete the following steps:
1. Verify that matching processors are installed in the correct processor sockets. Correct any mismatch found.
2. Check the IBM support site for an applicable service bulletin or firmware update that applies to this Processor
error.
3. (Trained technician only)Replace the system board
I.1800F [I.1800F]
Explanation: A processor family mismatch has been detected for one or more processor packages. Processors have
mismatched Family
Severity: Error
User response: Complete the following steps:
1. Verify that matching processors are installed in the correct processor sockets. Correct any mismatch found.
2. Check the IBM support site for an applicable service bulletin or firmware update that applies to this processor
error.
3. (Trained technician only)Replace the system board
I.1800C • I.1800F
Appendix B. UEFI/POST diagnostic codes 667
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