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）
Mục lục
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.
After hundreds of remote fix sessions, these are the errors that come up again and again.
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