I've been unable to get Mixtral (mixtral-8x7b-instruct-v0.1.Q6_K.gguf) to run well on my M2 MacBook Air (24 GB). It's super slow and eventually freezes after about 12-15 tokens of a response. You should look at M3 options with more RAM -- 64 GB or even the weird-sounding 96 GB might be a good choice.