Error 0xC0050051

Value: -1073414063 | 0xC0050051 | 3221553233

What does it mean ?

MCA_ERROR_PCI_BUS_PARITY  
Machine Check Event reported is a fatal PCI bus Parity error during a transaction type %3 at address %4 on PCI bus %5 reported to CPU %1. %2 additional error(s) are contained within the record.
Value: 81 | 0x0051 | 0b0000000001010001

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