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Cuda version 11

Posted on June 2, 2025

For running pmemd.cuda (from Amber molecular dynamics) a CUDA version of max 11 is necessary. The CUDA droplets just provide the newer 12.x version. Is there a way to install an older Nvidia driver and toolkit. Regards HANS HEINDL

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Bobby

June 3, 2025

Hey Hans!

I haven’t tried downgrading the CUDA version on a DigitalOcean GPU Droplet myself, but as far as I know, they come preinstalled with CUDA 12.x and there’s no official support for rolling back to 11. You might be able to manually uninstall the driver and install an older one, but that could break the default setup and cause issues.

If CUDA 11 is a hard requirement, I’d recommend reaching out to DigitalOcean support to see if they have a supported workaround, they should have more insight.

Let us know if you hear back!

- Bobby

alexdo

June 4, 2025

Heya,

A possible workaround might be using Docker. Sometimes you can avoid host-level downgrades by using a Docker image with CUDA 11:

If AMBER runs well inside containers, this could be the cleanest solution.

Regards

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