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What OS do you run on it? Is it hard to find software that works on it?

I’m running Ubuntu 20.04 for POWER9. You start from a server ISO and build up from there.

https://ubuntu.com/download/server/power

I don't have first-hand experience, but I saw a screenshot on Twitter of a Fedora system running on a Raptor workstation. The owner said he had no issues.

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