Hardware Model Specification
NVIDIA HGX H200 SXM5 8-GPU Subsystem Diagnostics
Classification: AI Datacenter & High-Performance Compute Equipment
Hardware operational fault codes, protection alarms, LED blink sequences, and step-by-step diagnostic fixes for the NVIDIA HGX H200 SXM5 8-GPU Subsystem.
1 Documented Faults
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Full Multimeter & Safety Isolation Procedures
Indexed Fault Codes for HGX H200 SXM5 8-GPU Subsystem
Step-by-step resolution manuals and root cause matrices
CODE XID 79
Severity: Critical
Difficulty: Advanced
GPU PCIe Fatal Dropped Bus
An unrecoverable PCIe fatal error occurred on the SXM5 interconnect fabric or upstream PCIe Gen5 switch/retimer link, triggering an XID 79 assertion where the GPU dropped entirely off the PCIe bus during heavy NCCL ring all-reduce communication.
⏱ 45-90 Mins
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