3 ms·

I have a dock with two 4k 60hz DisplayPort monitors that runs off TB3. Afaik that's not possible over USB.

kllrnohj 6y ago
TB3's display output is just displayport. Identical to displayport over USB-C. You're only giving up the data part of TB3.
- distances 6y ago
  TB3 is 40Gbps, USB-C 3.2 10Gbps. 4K@60Hz is possible over USB-C but 4K@120+Hz only with TB3 AFAIK (or dedicated DP cable of course).
  - kllrnohj 6y ago
    The 40Gbps is for the data connection of TB3. The display part of TB3 is independent and is just DisplayPort. Both TB3 and USB-C alt-mode can do DisplayPort 1.4, assuming both sides support it of course. TB3 only actually requires DisplayPort 1.2. There's actually no difference here whatsoever on the display-only side of things. (side note, USB 3.2 achieves up to 20Gb/s, not 10Gb/s, and TB3 is also realistically only 20Gb/s as well unless you're sticking to the super short 0.5m cables)
    - distances 6y ago
      Right, I was thinking of USB 3.1 Gen 2 which is 10Gpbs. Hooray for these naming schemes. But good to know about the display connection being the same. I was under the assumption that the increased data rate of TB3 could be used for DisplayPort connection too.
  - hackerfromthefu 6y ago
    USB-C 3.2 comes in 5Gbps, 10Gbs and 20Gbs variants, called Gen 1, Gen 2, and Gen 2x2 respectively
wlesieutre 6y ago
If you just want the displays, you can get that over vanilla USB-C: https://www.cablematters.com/pc-1220-126-usb-c-triple-4k-displayport-mst-hub-usb-c-to-displayport-splitter-with-dual-displayport-and-hdmi-for-windows.aspx https://www.cablematters.com/pc-1220-126-usb-c-triple-4k-dis... If you want displays and all your other dock stuff combined under a single cable, that's where you're better off with Thunderbolt, yes. The USB-C docks can do some of this (I think with DisplayLink) but not quite as well. A Thunderbolt dock doesn't limit your display choices like the comment I replied to was talking about though, you'd just use any normal DisplayPort screen. Worst case without it you're plugging in separate display cables in addition to a non-video USB hub.

TB3's display output is just displayport. Identical to displayport over USB-C. You're only giving up the data part of TB3.

distances 6y ago
TB3 is 40Gbps, USB-C 3.2 10Gbps. 4K@60Hz is possible over USB-C but 4K@120+Hz only with TB3 AFAIK (or dedicated DP cable of course).
- kllrnohj 6y ago
  The 40Gbps is for the data connection of TB3. The display part of TB3 is independent and is just DisplayPort. Both TB3 and USB-C alt-mode can do DisplayPort 1.4, assuming both sides support it of course. TB3 only actually requires DisplayPort 1.2. There's actually no difference here whatsoever on the display-only side of things. (side note, USB 3.2 achieves up to 20Gb/s, not 10Gb/s, and TB3 is also realistically only 20Gb/s as well unless you're sticking to the super short 0.5m cables)
  - distances 6y ago
    Right, I was thinking of USB 3.1 Gen 2 which is 10Gpbs. Hooray for these naming schemes. But good to know about the display connection being the same. I was under the assumption that the increased data rate of TB3 could be used for DisplayPort connection too.
- hackerfromthefu 6y ago
  USB-C 3.2 comes in 5Gbps, 10Gbs and 20Gbs variants, called Gen 1, Gen 2, and Gen 2x2 respectively

wlesieutre 6y ago

If you just want the displays, you can get that over vanilla USB-C: https://www.cablematters.com/pc-1220-126-usb-c-triple-4k-displayport-mst-hub-usb-c-to-displayport-splitter-with-dual-displayport-and-hdmi-for-windows.aspx https://www.cablematters.com/pc-1220-126-usb-c-triple-4k-dis... If you want displays and all your other dock stuff combined under a single cable, that's where you're better off with Thunderbolt, yes. The USB-C docks can do some of this (I think with DisplayLink) but not quite as well. A Thunderbolt dock doesn't limit your display choices like the comment I replied to was talking about though, you'd just use any normal DisplayPort screen. Worst case without it you're plugging in separate display cables in addition to a non-video USB hub.