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Add Serving mode on Blackwell section — clarify weight-only FP4 reality on GB10+vLLM

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@@ -31,6 +31,12 @@ To my knowledge this is the first publicly available NVFP4 of the DeepSeek-R1-Di
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  ## Quick facts
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+ ## Serving mode on Blackwell (GB10)
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+ On DGX Spark / GB10 with vLLM, this model serves as **weight-only FP4**: the 4-bit NVFP4 weights are dequantized to BF16 for each matmul; activations stay BF16. vLLM 0.20.x has no FP4-activation GEMM kernel for Blackwell (sm_120/121), so the MARLIN-NVFP4 path is weight-only regardless of the `input_activations` field in `config.json` — verified by direct logit comparison (W4A4-config and W4A16-config produce bit-identical output on this stack). This is the standard, and currently highest-quality, NVFP4 serving mode on Spark. On an FP4-activation-capable stack (TensorRT-LLM, or a future vLLM with a Blackwell FP4 GEMM) the same weights could run as true W4A4.
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  ## Quick facts
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