Is 1350 a fairly hefty OC on a reference RX480?
Ventilation may not be the best on his case, either.
It would be getting very hot or thermal throttling at that speed. Gamers nexus water cooled one and only managed 1390 to a reasonable level of stability. After that it was power limited.
After seeing that video of the strip down, the cooler looks like total garbage. I know the reference card is perhaps not supposed to have anything trick, but that heat sink is very poor. No way I'd get a reference one of these.
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