: Overheating or inconsistent power supply (PSU) delivery.
A transient issue where a PCIe card fails to initialize fast enough during POST, which may resolve upon a reboot. Troubleshooting and Fixes for 0x12 MCE
Indicates whether the error was an uncorrected fatal error (typically starting with 0xF , 0xE , 0xB , or 0xA ). x64 exception type 0x12 machinecheck exception link
An uncorrectable error detected on the PCI Express link, often resulting in "DETAILS: Uncorrectable PCI Express error detected".
What (CPU, motherboard, RAM) are in the system? : Overheating or inconsistent power supply (PSU) delivery
The Intel and AMD x64 architectures assign specific interrupt vector numbers to different system faults. is explicitly reserved for the Machine Check Exception (#MC) .
Comprehensive Guide to Fixing the "x64 Exception Type 0x12: Machine Check Exception" Error An uncorrectable error detected on the PCI Express
Exception 0x12 is unique. The Intel Software Developer’s Manual (SDM) and AMD Architecture Programmer’s Manual both specify that vector 0x12 is reserved exclusively for Machine Check Exceptions. When this vector is triggered, the CPU has detected an unrecoverable hardware error.
Following the trail of technical advisories from HPE Support , Elias began the digital surgery: