@timonsku @manawyrm nice.
I think technically the efficiency peaks at about 3.6V but at that point you drop down into the lower range of the RT8088's current delivery capabilities, which might glitch the core voltage rail out during high load.
if it's not obviously unstable at 4V I'd maybe try 3.8V and stress test it. writing a script that goes from 0% load to 100% load and back repeatedly, alternating pure CPU and memory bound loads, is a great way to check for voltage regulation stability.
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