买了 5070 Ti / 5080 / 5090，ComfyUI 装不上？这里是原因和解决方案。
花了大价钱买 RTX 50 系列，ComfyUI 装不上。这是我们最常见的远程修复场景。
1. 更新驱动到 575+
2. 装 CUDA 13.0 的 PyTorch：
pip install torch==2.9.1 torchvision==0.24.1 torchaudio==2.9.1 --index-url https://download.pytorch.org/whl/cu1303. 处理插件问题（SageAttention 用 --use-pytorch-cross-attention，跳过 xformers）
目錄
Your GPU is there, but ComfyUI refuses to use it. Here's every reason torch.cuda.is_available() returns False.
When a workflow breaks, most people guess. Here's the systematic decision tree we use in real support sessions.
ComfyUI plugins fight over numpy, pillow, and torch versions. Here's a real-world guide to finding and fixing dependency hell without nuking your environment.
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