Periodically I’m tempted by the ultra wide monitors on the market. If I buy one, it’ll be the 29” LG but my question is can the new pi 3b+ do 60 Hz at 2560x1080?
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The Pi 3B+ apparently has HDMI 1.4, which I think means it will support it, without being able to check though from the looks 4K (video) works. however it still has a similar GPU to previous versions so I'm not sure video etc will be able to run a native or higher resolution AND frequency. – Wilf Jun 01 '18 at 23:31
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No Raspberry Pi will play encoded video at reasonable framerates for resolutions greater than 1080i. I can't prove this for unencoded video, but the sheer bitrate should overwhelm any Pi easily, since I/O capacity will, is and always has been very limited on this platform. – flakeshake Jun 02 '18 at 07:23
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1Resolution of 2560x1440 is common. Did you really mean 2560x1080? – Chad Farmer Jun 07 '18 at 20:55
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All Pi models have the same Video Core, so the Pi3B+ is no different to earlier models in this respect.
There are some limitations in the modes which can be supported due to the pixel clock limit. See https://elinux.org/RPiconfig#Video
I suspect you are out of luck; even though the rate may be supported there seems to be no wide screen mode - it is possible to create custom modes. I have never seen a screen with a 64:27 ratio!
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2"You can try this" is the only part of this answer I could parse. – Dmitry Grigoryev Nov 15 '18 at 08:55
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1I think you should add the config.txt to your answer and explain what it does. And remove the random, irrelevant values – Dirk Nov 15 '18 at 09:20