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New Steam Deck beta client update: can improve battery life in low power games up to 6%
(steamcommunity.com)
this post was submitted on 15 Feb 2025
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Why would you run such games at half the framerate? 60fps was the norm back then.
Was it? afaik PAL was 50Hz but 25fps, and NTSC was 60Hz at 30fps. Two periods per frame because of interlacing or something like that.
No, not quite. 60fps (or 50fps for PAL regions) was basically always the target for 2D games rendered at 240p, because it was easily achievable with the hardware and looked way better.
When 3D games started to appear with the release of the PS1, Saturn and N64, 60fps was often out of the question because the hardware wasn't powerful enough.
Interlacing doesn't really have anything to with that. Interlacing just means that of the 480 lines of resolution, only half get shown on screen every frame (always the even or uneven ones). Since the image gets rendered in 480p anyway, it doesn't matter whether or not the game gets rendered at 60fps or not.
Except when using field rendering, which was popular on the PS2. There, only the lines that get shown that frame get rendered, which is why it only works at 60fps. Maybe that was what you were thinking about?
Did some more reading, I was probably thinking of broadcast TV signals, which were 25 or 30 fps because one frame is two fields. and I wrongly assumed CRT TVs could only do one thing, but consoles mainly did progressive video.