this post was submitted on 04 Dec 2023
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Steam Deck
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50hz draws less battery so my guess is that they assume players who cap their frame rate at 25 are more in need of battery life over low latency, because why else would you cap it that low?
Idk but that's what I would do
Where did you see it draw less? And by how much? Computing 50 frames per second does draw less than computing 75, but a display to render at 50 or 75, I have not seen anything with respect to consumption, so I'm curious.
I have just heard it mentioned in regards to both the steam deck and smartphones with high refresh rates. I don't know by how much the battery is affected but I know that lower refresh rate draws less. That why smartphones have variable refresh rate and lower their refresh rate to like 1hz when nothing is happening on screen. You can Google it if you want more info
You're confusing rendering and displaying. There is no doubt that rendering at higher fps requires more power draw. But were talking here about a fixed rendering framerate of 25 fps and a case of refreshing the screen at 50 or 75 hz using the same 25 fps rendering. This is not a usual scenario so there is little info about this, hence my initial point.
I don't have exact numbers, but there is some increase in power draw associated with refreshing the screen more frequently. It's certainly nowhere near as impactful as rendering at 50 FPS vs 25, but it's non-zero.
The only reasons (afaik) to have the refresh rate be higher than a locked FPS is to change the timing slightly. But frame times should be the same and the game should look better when the refresh rate is lower. Especially because 25 frames on a 50hz display means 1 duplicate frame per frame as opposed to 2 or so.