If you're going to replace the fan, I'd be tempted to replace the stock heatsink altogether. More airflow almost always helps, but finding the sweet spot inbetween the puny and the whacking huge could help to reduce temperatures a lot more than just replacing the fan alone. It just depends by how much you want to cool it down, how much room you have to work in, and how much you want to spend.
Do not meddle in the affairs of archers, for they are subtle and quick to anger.
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