fp16 is not working (Z-Image base incompatible with RTX 20 series, RDNA2 and older)

#22
by Dampfinchen - opened

Please look at this issue here: https://github.com/Comfy-Org/ComfyUI/issues/12176

This is a dealbreaker for users of GPUs older than Ampere (Pre RTX 3000-series, as well as pre- RDNA3.)

Many users still use these kind of GPUs without BF16 support, and Z Image Turbo still worked with the fp16 hack ComfyUI uses.

I hope this can be fixed.

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