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Please, for the love of god, make it obvious if a USB C cable can be used as a display cable or not. One thing that absolutely blows about USB C is that they al

by hbosch 5y ago

Please, for the love of god, make it obvious if a USB C cable can be used as a display cable or not. One thing that absolutely blows about USB C is that they all look the same, but to connect my LG UltraFine to my GTX 2070 I had to do literally hours of research before I could find a reliable cable on Amazon that was a “bidirectional USB C DisplayPort” cable because I naively assumed that USB C was a general purpose cable type that could do data/display/power/etc. Having one plug be capable (or incapable) of doing so many things melted my brain. Why can’t all USB C cables just do all the things? To me, the fact that I can plug a cable into my graphics card… and it fits… and then it does nothing… that’s awful physical UX.

dragonwriter 5y ago
> Having one plug be capable (or incapable) of doing so many things melted my brain. Good thing you missed the time when cables with DB9/DB25 connectors were everywhere, for every purpose.
- lmm 5y ago
  I mean yes, that sucked. Why are we going back to that?
evancox100 5y ago
What cable did you end up going with, and did it work? Am in an almost identical situation and would like to avoid "hours of research" myself!
- thermin 5y ago
  Any 5/10 Gbps from Amazon/AliExpress will work for 4k@60Hz.
viraptor 5y ago
> Having one plug be capable (or incapable) of doing so many things melted my brain. That's not different than USB-A. You can have charging-only, USB 2, USB 3, etc. cables. We had this for decades.
- throw0101a 5y ago
  > We had this for decades. The USB-C connector was an opportunity to fix it: mandate all ports and all cables be full-spec. No "up to" non-sense. And they squandered their chance.
- pantalaimon 5y ago
  USB 3 is color-coded and charging only Micro-B cables are an abomination that should be tossed into the trash.
Tijdreiziger 5y ago
> Why can’t all USB C cables just do all the things? I'd guess 'cost'.
- jdhn 5y ago
  What's the difference in cost between a cable that can do the bare minimum, and a cable that can do everything, assuming they're the same length? Just seems like the USB committee is unnecessarily complicating everything.
  - zamadatix 5y ago
    A couple of years ago I couldn't find a cable that did the max speed with max charging for any price. Now looking it seems like you can get a TB4 with 100W 3' for ~30 dollars and 6'-7' for ~60 dollars. Or a 5 pack of standard type c cables for ~10 dollars.
  - cesarb 5y ago
    > What's the difference in cost between a cable that can do the bare minimum, and a cable that can do everything, assuming they're the same length? A USB-C cable that can do the bare minimum needs five wires (one twisted pair for data, power, ground, and the configuration channel), and they can all be thin. A cable that can do everything adds to that four more differential pairs (which also have more stringent signal integrity requirements than the lone USB 2.0 pair), one extra pair for sideband use, and the power and ground wires must be thicker to handle the higher current. So it's tripled the number of wires, made some of them thicker, and the cable has to meet a more strict signal integrity. No wonder it's more expensive.
  - ziml77 5y ago
    That depends on the chosen wire gauge and length of the cable, but even the most cheaply made cable would be significantly more expensive if it supported all capabilities. You can't go lower than the cost of materials and cables necessarily use a lot of copper and plastic. Adding support for more capabilities requires adding more wires inside. And the more wires you have inside the cable, the more you have to worry about cross-talk, so you need even more material for shielding and you need to twist the wires tighter (and a tighter twist shortens the wires so you then need those to be longer to reach the same distance).
thermin 5y ago
It's in fact incredibly simple. Every USB-C cable that is not USB 2.0 (meaning 5gpbs and up) will be able to drive 4K@60Hz.
- thermin 5y ago
  *apparently active Thunderbolt 3 cables are an exception and won't work. But it's better not to rely on Thunderbolt 3 cables to be valid USB 3 cables. Of course, it's better now with Thunderbolt 4 where every Thunderbolt 4 cable is also an honest to god USB4 cable, and it's not as confusing for the consumer.

by hbosch 5y ago

dragonwriter 5y ago

> Having one plug be capable (or incapable) of doing so many things melted my brain. Good thing you missed the time when cables with DB9/DB25 connectors were everywhere, for every purpose.

lmm 5y ago
I mean yes, that sucked. Why are we going back to that?

evancox100 5y ago

What cable did you end up going with, and did it work? Am in an almost identical situation and would like to avoid "hours of research" myself!

thermin 5y ago
Any 5/10 Gbps from Amazon/AliExpress will work for 4k@60Hz.

viraptor 5y ago

> Having one plug be capable (or incapable) of doing so many things melted my brain. That's not different than USB-A. You can have charging-only, USB 2, USB 3, etc. cables. We had this for decades.

throw0101a 5y ago
> We had this for decades. The USB-C connector was an opportunity to fix it: mandate all ports and all cables be full-spec. No "up to" non-sense. And they squandered their chance.
pantalaimon 5y ago
USB 3 is color-coded and charging only Micro-B cables are an abomination that should be tossed into the trash.

Tijdreiziger 5y ago

> Why can’t all USB C cables just do all the things? I'd guess 'cost'.

jdhn 5y ago
What's the difference in cost between a cable that can do the bare minimum, and a cable that can do everything, assuming they're the same length? Just seems like the USB committee is unnecessarily complicating everything.
- zamadatix 5y ago
  A couple of years ago I couldn't find a cable that did the max speed with max charging for any price. Now looking it seems like you can get a TB4 with 100W 3' for ~30 dollars and 6'-7' for ~60 dollars. Or a 5 pack of standard type c cables for ~10 dollars.
- cesarb 5y ago
  > What's the difference in cost between a cable that can do the bare minimum, and a cable that can do everything, assuming they're the same length? A USB-C cable that can do the bare minimum needs five wires (one twisted pair for data, power, ground, and the configuration channel), and they can all be thin. A cable that can do everything adds to that four more differential pairs (which also have more stringent signal integrity requirements than the lone USB 2.0 pair), one extra pair for sideband use, and the power and ground wires must be thicker to handle the higher current. So it's tripled the number of wires, made some of them thicker, and the cable has to meet a more strict signal integrity. No wonder it's more expensive.
- ziml77 5y ago
  That depends on the chosen wire gauge and length of the cable, but even the most cheaply made cable would be significantly more expensive if it supported all capabilities. You can't go lower than the cost of materials and cables necessarily use a lot of copper and plastic. Adding support for more capabilities requires adding more wires inside. And the more wires you have inside the cable, the more you have to worry about cross-talk, so you need even more material for shielding and you need to twist the wires tighter (and a tighter twist shortens the wires so you then need those to be longer to reach the same distance).

thermin 5y ago

It's in fact incredibly simple. Every USB-C cable that is not USB 2.0 (meaning 5gpbs and up) will be able to drive 4K@60Hz.

thermin 5y ago
*apparently active Thunderbolt 3 cables are an exception and won't work. But it's better not to rely on Thunderbolt 3 cables to be valid USB 3 cables. Of course, it's better now with Thunderbolt 4 where every Thunderbolt 4 cable is also an honest to god USB4 cable, and it's not as confusing for the consumer.