The key components for planetary imaging are USB 3 and fast storage, as you want to be able to capture the planets at high frame rates to find those moments of good seeing.
I use an Intel NUC with an i3 cpu and multiple USB 3.0 ports. I fitted it with a SSD so that it doesn’t become the bottleneck. It’s not impossible to capture 100GB+ in an hour if you get serious.
So it doesn’t need to be seriously powerful, just needs a few components carefully chosen.
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