Achieving 200k context on a single 5090 using Q4 KV Cache and SKILL.state
Ok-Shower7286 · reddit · 2026-08-31
A user running Qwen2.5-32B (Q6) for coding on a single RTX 5090 faced VRAM limits, hitting the ceiling at under 150k context with standard KV Cache.
Solution:
- Adopted KV Cache Q4 quantization to save VRAM.
- Implemented the SKILL.state method to structure key information into an explicit state machine.
Results:
- Successfully expanded the context window to 200k.
- Logic: While Q4 incurs precision loss, the structured state from SKILL.state combined with information retrieval compensates for the raw content, making the trade-off safe and effective.
- This prevents frequent context compaction when dealing with complex, multi-file problems.
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