This is what the runtime reports, at Q8:

    total params memory size = 15645.19MB (VRAM 15645.19MB, RAM 0.00MB):
    text_encoders 7669.77MB(VRAM),
    diffusion_model 7331.05MB(VRAM),
    vae 644.38MB(VRAM),
    controlnet 0.00MB(N/A),
    extensions 0.00MB(N/A)

That suggests that 16GB RAM will not be enough.

In fact, like it appears in the reports above, it is "7b" as in

> 7B parameters in its visual generation component

It seems they calibrated the size to fill a 16GB VRAM near the limit. RAM requirements will vary.