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Thank you for contacting Intel Technical Support.
According to the technical information for the Intel® Server System R2208WT2YSR the MTBF details are:
*System MTBF Hrs @40C 45290 [Hours]
*System MTBF Hrs @35C 57768 [Hours]
*System MTBF Hrs @25C 75232 [Hours]
I hope this can be usefull for you.