Not sure what are you talking about ... but in that article it is mentioned that this Intel Core Ultra 9 285H MSI Prestige 16 AI E comes with 140W power adapter. Why do you think is that? If it was possible MSI could save few bucks for a cheaper power suply. Btw, MSI Prestige AMD version comes 100w PA(not 120W as I wrote.). This are obvsioly an 'adjusted' or fixed results.
Having extra capacity in a power adapter is the way to play it safe, and you can get transients that spike higher than average power draw. But if you have a fully charged laptop, plugged into a power meter, you'll find most never come anywhere near the power limit of the adapter. (The only exceptions are typically laptops with dGPUs, where you can basically double the total power draw thanks to having a GPU.)
There's a big gap between 65W and 120W. If a laptop can potentially exceed 65W (like with maxed out system power draw, plus charging a batter) you need to go to the next level. Usually, that's not going to be 20W higher, so you jump to 120W and now nothing the laptop might do will exceed that amount, or even come close to it.
But let me give a concrete example. The Asus Zenbook S16 with a 65W adapter can pull 36W at the wall, just for charging the battery. Assume 90% efficiency and that means it's using 32W roughly to charge the battery — about half the potential output of the adapter. If I boot it up, it basically hits the 65W adapter limit. I saw 70W at the outlet, which with 90% efficiency would be 63W. But if the battery can take 32W on its own to charge, that means if the laptop needs 50W the battery will have to charge slower and only get 15W. It would take twice as long to charge. So double the adapter to 120W (give or take) and you'd have full speed charging while doing anything else.
Asus didn't take that route, opting for slower charging. MSI has gone the other route. Maybe the ARL laptop draws up to 65W total as well, so it really needs the extra headroom to allow for charging while doing other stuff. It's not that the laptop itself pulls anywhere near 120W, but the combination of laptop plus battery charging can get close to that level. But if you take out battery charging, I'd be surprised if it was breaking 65W, even with a 45W chip.
Keep in mind that the MSI ARL laptop had battery life of over 15 hours with a 100Wh battery. That means it was averaging just 6.7W of power draw during the battery test. Which means the display, RAM, CPU, etc. could all get down to that little of power use.
Also, as another interesting aside, the "fast charging" power draw of a laptop will be much higher than the "finish off the charge and reach 100%" power draw. The Asus S16 for instance gets to maybe 95% charge with fast charging (the 32W I mentioned) and then the last 5% or so happens at a more sedate ~15W rate. (It might even have more charging zones, as I think I saw up to 40W power draw initially before that dropped to 32W.)
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