GPU Memory Clock Throttle
GPU memory clock throttling reduces memory bandwidth and training performance when memory is under-utilized.
GPU memory clock throttling reduces memory bandwidth and training performance when memory is under-utilized.
What this failure is
GPU Memory Clock Throttle is a Hardware failure seen during ML training runs. GPU memory clock throttling reduces memory bandwidth and training performance when memory is under-utilized. Common tags: Gpu, Memory Clock, Throttle, Performance.
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Why it happens (the mechanism)
GPU memory clock throttles when memory is not fully utilized. Idle memory causes clock throttling. Power management reduces memory clock. Taken together, these mechanisms explain why the failure is reproducible, why it tends to surface on specific workloads or scales, and why generic mitigation attempts often fall short without addressing the underlying cause.
What you'll observe
- Training is slower than expected
- GPU memory clock is lower than rated
- Memory bandwidth is below maximum
Common symptoms and what they mean
| Symptom | Why it happens |
|---|---|
| nvidia-smi shows memory clock lower than max | GPU memory clock throttles when memory is not fully utilized |
| Performance varies with batch size | Idle memory causes clock throttling |
| Memory-bound operations are slow | Power management reduces memory clock |
Which systems are affected
- Memory-bound models
- Small batch sizes
- Variable workload patterns
How to confirm this is the problem
Use this checklist to test the hypothesis against a small reproduction. No single line proves the root cause, so preserve the preceding events and compare one variable at a time.
- ✓Reproduce the failure from a clean checkpoint/seed: the symptom must appear without warm-up state from a previous run.
- ✓Verified signal present: nvidia-smi shows memory clock lower than max
- ✓Verified signal present: Performance varies with batch size
- ✓Verified signal present: Memory-bound operations are slow
- ✓A targeted fix from the "How to fix it" section eliminates or substantially reduces the symptom within one validation pass.
The fix and the prevention pattern
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Root cause
- GPU memory clock throttles when memory is not fully utilized
- Idle memory causes clock throttling
- Power management reduces memory clock
The fix and how to prevent it
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