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Ok a bit off topic but isn't a 1200W PSU overkill for this system? For a 9950X and 1080, 500W seems plenty.

I'm hoping to use most of this system for the next 10 years. At some point, I want to add some beefy GPUs to it when I get back into 3D again.

I see it says Corsair so cannot tell what exact model it is but I did relatively similar thing. Reason being if you keep the load under certain wattage the PSU will run in passive cooling mode. My rig will never reach 50% of what Corsair SF750 Platinum can deliver and not mention in normal light load circumstances. It spins up its fans only when the load reaches ~300W or so.

Some people are very anal about any kind of noise coming out of their rigs. I personally undervolt everything to keep the fans at bay/minimum and having extra legroom in PSU department helps a lot

Same. Part of the background info on this is PSUs are usually most efficient at (or just under) 50% load. They are also more efficient at 240 V than 120 V, if you have the circuit. So the real efficiency can end up varying significantly, depending how you use it. The efficiency is not usually much to write home about in terms of your electric bill, but it does help drive the ability for the PSU to cool itself passively.

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