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Can I run h2o-lightning-4b on a Mac with 24 GB?

Yes

Its published weights (9.32 GB) fit in the 16.0 GB a Mac with 24 GB can use, with room for ≈ 198K tokens of context.

Full analysis of h2o-lightning-4b Everything that runs on Mac with 24 GB Get the weights on Hugging Face
hf download h2oai/h2o-lightning-4b

Files and context on Mac with 24 GB

Each file of h2o-lightning-4b (and of GGUF versions the site has analyzed), and how much context fits next to it, with the context cache in 16-bit or 8-bit.

FileSizeOn Mac with 24 GB Context (16-bit)Context (8-bit)
As published9.32 GBFits198K256K
4-bit (estimate)2.62 GBFits256K256K

h2o-lightning-4b on other hardware

Popular models that run on Mac with 24 GB

Assumes 67% of the Mac's memory is usable (macOS's default limit for the GPU; it can be raised) and at least 4K tokens of context for one conversation, with the context cache in 16-bit unless noted. Fits leaves at least 20% of that memory for context; Tight leaves less.