FYI, llama.cpp (which antirez/ds4 is inspired by) supports system ram. E.g. [1] is a good guide for running a similar-sized model with 128gb ram and a 3090-sized GPU.

[1] https://unsloth.ai/docs/models/tutorials/minimax-m27

(Unsloth's deepseek-v4 support is still WIP)