Hardware Model Specification
NVIDIA HGX H200 8-GPU Baseboard Diagnostics
Classification: Datacenter GPU & AI Accelerators Equipment
Hardware operational fault codes, protection alarms, LED blink sequences, and step-by-step diagnostic fixes for the NVIDIA HGX H200 8-GPU Baseboard.
1 Documented Faults
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Full Multimeter & Safety Isolation Procedures
Indexed Fault Codes for HGX H200 8-GPU Baseboard
Step-by-step resolution manuals and root cause matrices
CODE SXid 120 / NCCL Timeout
Severity: Critical
Difficulty: Advanced
NVLink Link Down Timeout Error
An NVLink high-speed interconnect physical/logical link degraded or dropped unexpectedly, triggering SXid 120 (NVLink Link Down). Because point-to-point ring/tree communication halted mid-collective operation, the NCCL execution watchdog timer expired with a collective timeout.
⏱ 45-90 Mins
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