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+# cu126 PyTorch for Pascal GPUs (CC < 7.5)
+
+ComfyUI's `comfy --skip-prompt install --nvidia` installs the latest cu130
+PyTorch build, which only supports compute capability >= 7.5 (Volta and
+later). GPUs like the GTX 1050 Ti (CC 6.1, Pascal) produce a cryptic error:
+
+```
+RuntimeError: Found GPU0 which is of compute capability (CC) 6.1. The current
+PyTorch installation supports... [sm_75, sm_80, sm_86, sm_90, sm_100, sm_120]
+```
+
+## Fix
+
+After `comfy install --nvidia`, reinstall torch from the cu126 index:
+
+```bash
+/path/to/comfy/ComfyUI/.venv/bin/pip install --force-reinstall \
+  torch torchvision torchaudio \
+  --index-url https://download.pytorch.org/whl/cu126
+```
+
+cu126 supports CC 5.0 and up (sm_50, sm_60, sm_70, sm_75, sm_80, sm_86, sm_90),
+covering Pascal, Maxwell, and all later architectures.
+
+## Verify
+
+```bash
+/path/to/comfy/ComfyUI/.venv/bin/python -c "
+import torch
+print(f'CUDA: {torch.cuda.is_available()}')
+print(f'Device: {torch.cuda.get_device_name(0)}')
+print(f'CC support: {torch.cuda.get_arch_list()}')
+"
+```
+
+Expected output for GTX 1050 Ti:
+```
+CUDA: True
+Device: NVIDIA GeForce GTX 1050 Ti
+CC support: ['sm_50', 'sm_60', 'sm_70', 'sm_75', 'sm_80', 'sm_86', 'sm_90']
+```
+
+## Affected GPUs
+
+All Pascal and earlier GPUs:
+- GTX 10xx series (1050, 1060, 1070, 1080)
+- GTX 9xx and earlier (Maxwell, Kepler, Fermi)
+- Any GPU with CC < 7.5
+
+## Why cu126 works
+
+cu12.6 ships with nvidia-cublas, nvidia-cudnn, and all CUDA toolkit
+components for multiple CC targets including sm_60. Later CUDA releases
+(12.8+) dropped pre-compiled kernels for pre-Volta architectures to reduce
+wheel size.