GPU × local model compatibility
Can RTX 4070 12GB run OpenAI gpt-oss-20b?
No — it exceeds available memory.
This pairing answers a common edge case: official MXFP4 weights plus runtime and cache overhead can exceed a 12GB card.
14.28GBVRAM required
12.00GBAvailable memory
2.28GBVRAM shortfall
MXFP4Recommended quantization
8KContext
Calculated estimate, not a measured benchmark.