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safest max GPIO voltage input
I have my TB with a power source which connects directly to GPIO
However, given subpar cables, i decided to "over-voltage" by applying 5.25 V which seems to be the upper limit for USB specification. It would typically oscillate dynamically according to load anyway (let's say, between 5.1 and 5.25 )

So which would be the safest upper limit for input voltage? is 5.25V OK ?

anecdotal info : for brief moments i accidentally put 5.3V without any noticeable issue however i wouldn't apply that voltage for much long without advice at least
I can't assure the correct voltage, but I think in a range of plus or minus 5% it won't harm anything.

But if you're facing huge voltage drop, caused by high current demand, it would be better to try to increase the wire section up to 1 mm2, and make sure that it doing a good contact.
Light blue words might be a link. Have you try to click on them? Big Grin

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