Most power supplies from reputable vendors at least conform to the bare minimum of an '80 Plus' rating, meaning you should get a minimum of 80% efficiency at 20%, 50%, and 100% load.

Many (but not all) power supplies are rated on the 80 Plus certification system, and there are six different labels ascribed to a PSU. These are 80 Plus, 80 Plus Bronze, 80 Plus Gold, 80 Plus ...

For example, an 80 Plus White 500W power supply at 50-percent load would work out to 250W DC power, or 312.5W AC power. You’ll use that latter number (312.5) when tabulating your electricity ...

Power supply OEMs such as Corsair generally offer a warranty of around ten years. However, if you're buying used parts, those warranties are unlikely to be transferrable.

I apply a 50% derating to any Chinese power supply label, because otherwise they blow up in short order. So you'll want about a 10A 24V supply and a 5A rated buck converter to drop to 5V.

A non-modular power supply has all of its interior cables hardwired into the side. Whether you need them or not, you'll get every single cable in a tight bundle attached to the side permanently.

Once upon a time, building yourself a power supply required sourcing all manner of components, from transformers to transistors, knobs, and indicators. These days, everything’s a bit more int… ...

Though it does highlight, in a roundabout way, the new power supplies Corsair is releasing right now. Including new Shift HXi models: 1000 W, 1200 W, and 1500 W.