CUDA 13.1
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RTX 5090 CuPy Setup: Blackwell Architecture & CUDA 13.1
Read Full Article: RTX 5090 CuPy Setup: Blackwell Architecture & CUDA 13.1![[D] RTX 5090 / 50-series CuPy setup (Blackwell architecture, CUDA 13.1 required)](https://www.tweakedgeek.com/wp-content/uploads/2026/01/featured-article-9252-300x171.png)
Users experiencing issues with CuPy on RTX 5090, 5080, or 5070 GPUs should note that the new Blackwell architecture requires CUDA 13.1 for compatibility. Pre-built CuPy wheels do not support the compute capability of these GPUs, necessitating a build from source. After uninstalling existing CuPy versions, install the CUDA Toolkit 13.1 and then CuPy without binaries. For Windows users, ensure the correct path is added to the system PATH. Proper configuration can lead to significant performance improvements, such as a 21× speedup in physics simulations compared to CPU processing. This matters because it highlights the importance of proper software setup to fully utilize the capabilities of new hardware.
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