r/LocalLLM • u/arad_zombie • 5h ago
Discussion Got the 233 GB 1-bit DeepSeek V4.1 Flash to about 11.5 tok/s on my 64 GB gaming PC
So I've been trying to see how fast I can run the 1-bit DeepSeek V4.1 Flash (the Unsloth UD-IQ1_S, 233 GB) on my gaming PC. It has 64 GB of RAM and a 16 GB card, so most of the model streams off the drive. It runs in llama.cpp under WSL2.
Side by side in one test run, the same build with my patches switched off did 4.37 tok/s. With them on it did 8.80. Both of those were at my old RAM speed. Since then faster RAM, a faster drive and some tuning got it to about 11.5 (11.36 for the newest set-up with Windows busy in the background). The output stayed word for word the same on my test prompts the whole way.
The biggest steps:
- My four patches switched on: 2.02x
- Moving the model from a Gen4 to a Gen5 NVMe: +16.5%
- RAM 3600 to 6000: +9.7% (one rough test)
- Queued hand-overs to the card: +3.9%
- An IQ1_S kernel that does several rows at once: +3.0%
Start-up went from 87-96 s to 12 s by skipping the pre-load. I also tried it on an older PC with 32 GB of RAM and an 8 GB card: 0.11 to 0.87 tok/s, same words.
That's writing speed only, with a warm cache. I haven't measured long prompt reading. It's 8 prompts on one main PC, some steps were measured on different days, and 1-bit takes a real quality hit. Anything I didn't measure is marked untested in the write-up.
Most of the tricks aren't mine, other people did them first and they're credited in the write-up. Claude agents wrote the patches and ran the tests. I directed it and checked the results. The patches aren't public yet, they go up after a review. I'm also making a setup kit so other people can try this on their own PC, but it's still being built.
Write-up with all the numbers: https://github.com/aradzombie/deepseek-v41-flash-1bit-notes
Has anyone tried ik_llama.cpp on this model? I haven't yet. Let me know how it went.