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Run Qwen 3.8 Flash Next (125B) on consumer hardware (RTX 4090) at 100T/s

806 points · 356 comments · snehesht

  1. hecturchi · · focus · HN ↗
    - Tiny context size or hours to load it

    - Hard to benefit from thinking and preserve thinking given token cost.

    - Low quants reduce accuracy heavMTP draft can make it make the same mistakes all the time when calling tools, formatting output or following basic guidelines. Otherwise 2x-4x slower.

    - K/V quants probably quantized too make things less accurate.

    Useful would be combinations with:

    - Full context size so it can code and think a bit.

    - Draft MTP <= 2 so it doesn't trip

    - Q4 quants or better so its accurate

    - q8 cache or better so it stays accurate.

    - 20 token/s so it finishes while reviewing previous step.

    - 1000 tokens/s context load so compactions don't waste 10+ minutes.

    - And enough left RAM for 50+ context checkpoints so that it can progress quuckly.

    Closest you have is Qwen3.6-35B-A3B-MTP.

    Latest gens (Qwen3.8 and co.) are just too big for low specs. 27B dense models seem to be ok for integrated >=92 GiB RAM.

    Source: I have low specs and tried them all for agentic use + coding.

    1. kennywinker · · focus · HN ↗
      Everyone's definition of usable is different, but I disagree with your estimation of the specs required to be useful. I am able to do useful coding on Qwen3.8-27b, with 100k context and 16gb VRAM, q8 cache. I feel I'm living right on the cusp... my GPU is old (2016, pascal), so to get usable speeds I have to drop to a Q2 quant - which still gets stuff done, but the difference with q4 is noticeable. Q3 is close enough I don't really notice the difference between it and Q4, but it's too slow on my system. More context would be nice, but it's not that hard to work within ~100k.
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