I haven't built one in over 10 years and have been using high end laptops for work. When I last built one, all power sources were mounted at the top. What changed to have it move down to the bottom?
They got heavier.
So you need a stronger case.
Too much weight at the top of the PC.
This way they keep the case the same.
PSUs have been primarily bottom mounted since ~2008. You still see cheap bottom of the barrel prebuilts with top mounted PSUs these days, but it's uncommon. What changed is higher TDPs of modern CPUs and GPUs; the top is more or less reserved for more ventilation/fans/radiators.
Thanks for taking the time to explain it.
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