BSOD 185 (CHIPSET_DETECTED_ERROR): causes and diagnosis

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: A parity error in the system memory or I/O system was detected.

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CHIPSET_DETECTED_ERROR

CHIPSET_DETECTED_ERROR is bug check 0xB9. The Microsoft reference marks this stop as very infrequent and does not define a public interpretation for parameters 1 through 4. The name says which bug-check category was selected, but it does not expose a chipset-vendor register map or a universal hardware syndrome.

Separate the stop name from the root cause

A firmware or hardware component may be relevant, yet the page contract does not justify declaring the motherboard defective from 0xB9 alone. Preserve the crash dump and identify the execution path, platform modules, and any hardware-error reporting visible in that specific dump. The same symbolic stop on different systems is not enough to assume an identical failing component.

Useful first checks

Keep the exact BIOS/UEFI revision, Windows build, and raw bug-check arguments.
Use !analyze -show 0xB9 for debugger-known metadata and !analyze -v for the captured failure.
Correlate repeated dumps with firmware or driver changes only after the stack or other dump evidence points to that layer.

References

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