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So I got a mod with more map sizes and my eyes popped when I saw that one size was 25k stars. So here I am wondering what kind of system could even generate such a large galaxy, let alone run it in late game. How much memory would that need?
I don't know if stellaris' game engine is calculating more by GPU or CPU but either must be good. You'll need more RAM for it, too. As long as nobody tries it out and report the system specs, we won't be able to tell.