CivArchive
    Fluxed Up [Flux NSFW Checkpoint] Nunchaku (int4/fp4) - 5.1-INT4
    NSFW
    Preview 101124543
    Preview 101124665
    Preview 101124623

    Nunchaku NVFP4 version of the Fluxed Up 5.1 model. Some quality issues, legs seem to get weird sometimes. Can use with the turbo lora and seems to produce decent results with Euler/Simple, 8 steps. Without the turbo lora you can use DPM++ 2M/Beta, 30 steps.

    I reduced the smoothing grids to speed it up, I might try it again with more grids when I have more time.

    Description

    INT4 version as requested. This is also a fast smoothed version, so quality may not be great. I don't have any hardware that'll run int4, nunchaku just crashes when I try, so I can't really test it out. The eval samples after the quant completed looks fine, so should be okay? ... Good luck!

    FAQ

    Comments (23)

    Gaydevai_pauloSep 18, 2025· 4 reactions
    CivitAI

    Its fp4, but i have rtx 3070, sad

    Yes please int4

    diego892009410Sep 18, 2025

    What does that mean? I have 3060, this won’t work?

    Gaydevai_pauloSep 18, 2025· 1 reaction

    @diego892009410 yes. its work only rtx 40-50

    antar195702258Sep 18, 2025

    @Gaydevai_paulo 

    Only 50 series, not 40

    thaddeusk
    Author
    Sep 18, 2025

    I'm still fiddling with quantization settings to speed up the process without losing much quality, but I can see about making an int4 version, too. Smoothing can take up to 40 hours and this is also my gaming PC :).

    thaddeusk
    Author
    Sep 18, 2025

    I should be able to get an in4 version released by this weekend.

    thaddeusk
    Author
    Sep 18, 2025

    I did a quick int4 smooth and quant for now, will post it as soon as I finish converting to nunchaku, merge into a single file, test to make sure it actually works, then generate some test images. probably in like 20 minutes.

    diego892009410Sep 18, 2025

    @thaddeusk Can you post the recommended settings, like scheduler and sampler for Stability Matrix? 

    thaddeusk
    Author
    Sep 18, 2025

    @diego892009410 I don't know what Stability Matrix is. I put what I used in the description, and the images have attached workflows in the metadata, so you should be able to use those as a starting point.

    thaddeusk
    Author
    Sep 18, 2025

    so, I have the model ready to go, but the ComfyUI-Nunchaku node won't let me run an int4 model on my blackwell card, so I'm not sure how to test it first :P. Might just modify the script to ignore that to see how it goes.

    edit: Well, that just crashes ComfyUI. I get the same error for the stock F1D int4 model, so maybe it'll work? I'll just post it and let you guys test it out, I guess.

    thaddeusk
    Author
    Sep 19, 2025

    It's posted. I just added a few images from the FP4 run. Let me know if it works.

    flo11ok874Sep 25, 2025· 2 reactions

    @thaddeusk It works like a charm at Rtx3060 with Turbo lora is like 15sec for 1024x1024 and 768x1344 (this is best resolution for this model I think). Thanks for share the model.

    thaddeusk
    Author
    Sep 25, 2025· 1 reaction

    @flo11ok874 Glad to hear it's working! :)

    pursuit_of_beautySep 18, 2025· 2 reactions
    CivitAI

    I have nothing personally against merges, but for your hopes of greater adoption of your models, consider images where the faces are not nearly identical, on a biological (male) level, different faces, even if not quite as hot, still hold greater appeal. (your examples are great though), this is intended to be a helpful constructive posting.

    thaddeusk
    Author
    Sep 18, 2025

    I don't really care if people adopt it, I'm just fiddling with quantizing models using nunchaku. I just copied and pasted prompts from the original model's images to see if I can produce similar images. I figured I'd post it just in case anybody cared to try it out. Thanks, though!

    Fit_Wafer9678239Sep 19, 2025· 7 reactions
    CivitAI

    Really appreciate the int4 version. Thanks for your work.

    thaddeusk
    Author
    Sep 19, 2025

    No worries. I couldn't test it on my hardware, how's it working?

    Fit_Wafer9678239Sep 20, 2025· 1 reaction

    @thaddeusk It is working perfectly, and very fast, on my 3080ti. Will post some of my generations later. Thanks again.

    thaddeusk
    Author
    Sep 21, 2025

    @Fit_Wafer9678239 Glad to hear!

    flo11ok874Sep 23, 2025· 1 reaction

    @Fit_Wafer9678239 And you no post generation later, now people wonder is it bad gens?

    crazyliuOct 3, 2025· 5 reactions
    CivitAI

    Thank you very much for your quantization version. The effect of int4 is very good. I wonder if you can continue the work and quantize some other NSFW models, such as flux kontext or flux krea

    thaddeusk
    Author
    Nov 2, 2025

    I think the base flux models tend to get official releases from the Nunchaku team, was there a specific fine-tuned version of those that you wanted?

    Checkpoint
    Flux.1 D

    Details

    Downloads
    2,468
    Platform
    CivitAI
    Platform Status
    Available
    Created
    9/19/2025
    Updated
    4/28/2026
    Deleted
    -

    Files

    fluxedUpFluxNSFWCheckpoint_51INT4.safetensors