This has been pretty well known for a while IMO. There's a certain 'buy extra just in case' to this as well. It's an easy path to get on because the change in PSU price going from a 500w to 650w to 750w isn't all that much as part of a build's overall price.
I bought a 650w for exactly these reasons. Modern systems are quite efficient with CPU's and system components drawing less and less power overall. Only GPU's are still hogs, as shown by Red Teams 395w current gen and Green Teams next gen 400w cards; Even those numbers might not mean actual power draw at full load.
The days of needing 1000w or even 1200w supplies probably never existed, except in fringe cases of @3.0charlie running (killing?) Dual CPU on SR2 with SLI gpus or something crazy.
I have been suggesting people buy more appropriate psu’s for some time now. Mid tier setups are fine on 5-600W. A “normal” Gaming pc 650. High end GPU and cpu with OC on both 750. It is out of the norm to need 850+, unless you are going extreme OC, multi GPU, or
You could get away on less then that if you are constrained, or using a power supply you already have, but that is how I generally recommend. Keeps you in the efficiency curve, and with ample headroom.
The new 3090 will buck the trend a bit though I would guess.
I think people do this in general for all thing more is better more powerful bigger is better type thinking hehe
this sort of reminds me my PSus I have been using are decent name brands but they are old probably time to replace them wished there was a way to service them I really dont like waste
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