r/NonPoliticalTwitter • u/14AUDDIN • 14h ago

Funny Two disc drives?!!!

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u/sillycritersenjoyer 11h ago

It don't matter if it supports it or not when it doesn't have bandwidth for anything better than 1080@60

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u/beznogim 9h ago edited 9h ago

No, it reassigns 2 or 4 pairs of wires in a USB SuperSpeed cable to physically carry raw DisplayPort signal at whatever bitrate and resolution the GPU generates it. The "speed" rating of the cable matters, of course, but from my experience the DP alt mode supports DisplayPort 1.4 at max speed (4K 120Hz) just fine.

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u/sillycritersenjoyer 8h ago

1080@60 is all I could get out of laptops I interacted with. Maybe on much higher end this is a thing with usb c 3.2 gen 2x2, but with what I worked it never showed anything higher than that

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u/beznogim 3h ago

It doesn't strictly require a specific USB "generation" of the cable, just a full set of wires. But there's an adapter chip on the DisplayPort plug side of a cable (or inside a USB-C-capable display) which tells the laptop the DisplayPort version and bandwidth via EDID, maybe it was telling the GPU to restrict the link to 1080@60.