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Where does a 70B model actually fit? Dual RTX 3090 vs DGX Spark 64GB vs 128GB

70B dense models are the point where a single consumer GPU stops being enough. Here is what the memory math says for the three setups people usually compare. The baseline: Llama 3.3 70B at Q4_K_M About 40.7 GB of weights. Add a KV cache and an activation buffer: Context Approx. memory 4K ~46.1 GB 8…

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  1. 2026-11-06 02:36 · DEV Community — AI
    Where does a 70B model actually fit? Dual RTX 3090 vs DGX Spark 64GB vs 128GB

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