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[Hardware] DeepGEMM MoE: extend device gates to SM 12.x consumer Blackwell #41062

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[Hardware] DeepGEMM MoE: extend device gates to SM 12.x consumer Blackwell #41062

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6 changes: 3 additions & 3 deletions vllm/model_executor/layers/fused_moe/experts/deep_gemm_moe.py
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Original file line number Diff line number Diff line change
Expand Up @@ -354,9 +354,9 @@ def activation_format() -> mk.FusedMoEActivationFormat:
def _supports_current_device() -> bool:
from vllm.platforms import current_platform

return (
is_deep_gemm_supported()
and current_platform.is_device_capability_family(100)
return is_deep_gemm_supported() and (
current_platform.is_device_capability_family(100)
or current_platform.is_device_capability_family(120)
)
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@gemini-code-assist gemini-code-assist Bot Apr 27, 2026

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high

This check can be simplified by using has_device_capability(100), which correctly identifies all Blackwell-family GPUs (including both SM 10.x and 12.x) while excluding Hopper (SM 9.0). This is more idiomatic in vLLM for checking minimum architecture requirements.

        return (is_deep_gemm_supported()
                and current_platform.has_device_capability(100))


@staticmethod
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7 changes: 5 additions & 2 deletions vllm/platforms/cuda.py
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Expand Up @@ -545,8 +545,11 @@ def support_static_graph_mode(cls) -> bool:

@classmethod
def support_deep_gemm(cls) -> bool:
"""Currently, only Hopper and Blackwell GPUs are supported."""
return cls.is_device_capability(90) or cls.is_device_capability_family(100)
"""Currently, Hopper, datacenter Blackwell (SM 100+) and consumer
Blackwell (SM 12x — RTX 50-series, GB10/DGX Spark) are supported."""
return (cls.is_device_capability(90)
or cls.is_device_capability_family(100)
or cls.is_device_capability_family(120))
Comment on lines +550 to +552
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@gemini-code-assist gemini-code-assist Bot Apr 27, 2026

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high

The logic for checking Blackwell support can be simplified using has_device_capability(100), which covers both SM 10.x and 12.x (and matches the "SM 100+" description in the docstring).

Important: Please ensure that vllm/utils/deep_gemm.py::should_auto_disable_deep_gemm is also updated to include SM 12.x (e.g., by using has_device_capability(100) there as well). Currently, it only checks for family 100, which means consumer Blackwell GPUs will bypass the accuracy-related auto-disablement for specific models (like Qwen 3.5) known to have issues with DeepGEMM's E8M0 scale format on Blackwell.

        return cls.is_device_capability(90) or cls.has_device_capability(100)


@classmethod
def is_integrated_gpu(cls, device_id: int = 0) -> bool:
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