What's the oldest Mac you have running on the newest OS?

I just installed 10.15 catalina on my MBP 17" 2008 pre-unibody (the one w/the powerbook G4 chassis). It's the newest OS it can run on while still being usable. I had it on Big Sur and then Monterey, but the CPU usage was constantly at 100% at idle and doing something simple like opening safari would take 15+ seconds.

Just curious to hear about others' experiences.

submitted by /u/Velocity211
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