Error 0xC0050049

Value: -1073414071 | 0xC0050049 | 3221553225

What does it mean ?

MCA_ERROR_MEM_1_2  
Machine Check Event reported is a fatal ECC memory error at physical address %3 reported to CPU %1. %2 additional error(s) are contained within the record.
Value: 73 | 0x0049 | 0b0000000001001001

Where does it come from ?

FACILITY_MCA_ERROR_CODE  
Machine Check Architectures (Intel Pentium Pro and Itanium processors)
Value: 5 | 0x005 | 0b00000101

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Other Errors for FACILITY_MCA_ERROR_CODE