>add up the total wattage of individual components under average load (which you should be able to find in manufacturer's specifications or google) >buy a PSU with double wattage Modern PSUs are most efficient under ~50% load, pic related, so you should aim for that.
They don't calculate well, but they're a good place to get a rough estimation. The only way to know how much your components will draw is to measure that yourself. The idea is to get a rough idea of what kind of power you'll need and buy a PSU well above that.
Also if you're taking that other anon's advice (>>50825902) he said look at the average power draw of your components and double that. E.g. if your computer uses 300w just staying on you should aim somewhere around 600w.
>>50826214 That was me. I was saying if you're going to use an online calculator that gives a rough estimate of your max power draw then you should stay on the safe side and get a PSU that can do more than the estimate says. It's better to have a PSU that can do more than you need than to try and strain a cheaper PSU.
If you were going to do that you need to look for the average wattage. It'll save you money in the long run since your PSU will be running more efficiently, but it's not necessary. I never bothered myself.
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