The first sum is simple. A model needs roughly its parameter count times the bytes per parameter just to hold its weights, before any memory for the clip it is making. Wan 2.2 TI2V-5B shows the whole ladder in files you can download today, since its transformer is 20 GB in the 32-bit Diffusers repository, 10.0 GB as Comfy's 16-bit file, 5.4 GB as a Q8 GGUF, 3.43 GB at Q4_K_M and 1.85 GB at Q2_K. Each step down fits a smaller card and gives up some quality, and the text encoder and VAE need room on top.
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