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Idk if you‘re allowed to post links here, but it was a thread on stackexchange. Here you go:
 
Well I always connect my eGPU and whatever is charging on the right side ever since people been discussing thermals on the forum.
 
For years I have connected a series of different MacBook Pro's from the left side just because of where the outlet is, and I have never had any unusual fan performance issues, or heat issues.
 
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