It’s stated specifically in the TB4 specifications as it contains DP2.0 and USB 4.0. And it’s 40Gbps Bidirectional, as in 40Gbit one way, and 40Gbit the other way.
Thunderbolt 4 includes support for DisplayPort 2.0, allowing it to power up to three 10K monitors at the same time, or one 16K monitor at 60Hz. Using both channels with 80Gbps total speed.
With thunderbolt 3 it was caped at display port 1.2/4 depending on controllers used
And why only one 6k display was supported for one port.
I’d take Intel’s documentation over TrippLite’s documentation on Thunderbolt specs.
https://www.intel.com/content/www/u...upgrade-gaming-accessories-thunderbolt-4.html
Intel explicitly states: Thunderbolt 4 ports have the same high-speed 40Gbps bandwidth as Thunderbolt™ 3. However, minimum PCIe data requirements have
increased from 16Gbps to 32Gbps. This means that high-speed external PCIe devices like storage and external graphics could see significant increases in transfer rates and performance.
Note that Thunderbolt 3 was also capable of 32Gbps PCIe, but it wasn’t
required to implement it.
I also notice you:
A) Don’t link to the page you took a screenshot of.
B) Don’t include the part of the page that states the Thunderbolt 4 specs, because they don’t agree with your claims:
https://www.tripplite.com/products/thunderbolt-4
Note that even TrippLite states 40Gbps for TB4, and 8K @ 60Hz, which is DP 1.4 with DSC. TB4 bumps the required DisplayPort requirement to 1.4, and clearly also requires DSC support.
To talk to the screenshot you made: TrippLite made a couple of omissions, which can be confusing to an average reader not familiar with Thunderbolt, but are super important for conveying the information accurately.
First, Thunderbolt 3 and 4 as available on the market are a single 40Gbps full duplex connection. That’s it. While the
cable was
originally reported by anandtech as being able to carry two channels, it’s not used in either TB3 or 4. It’s possible that this second PHY channel is what will allow TB5 to deliver 80Gbps, but for now, both TB3 and 4 are a single connection. So for TrippLite to use the discussion they did, is misleading at best.
As for DisplayPort mode, things get a bit more complicated. For DisplayPort 2.0, it uses the
Thunderbolt 3 PHY layer to reach the 80Gbps needed. Which means it has to be using both channels in the cable. However, Intel’s current TB4 controllers are DP1.4a compliant:
https://www.intel.com/content/www/u...-thunderbolt-4-controller/specifications.html, meaning even though DP 2.0 can be carried over a Thunderbolt 3 active cable, the chips required to handle the alt mode aren’t (yet) here. But with Intel releasing GPUs with DP 2.0 support “Soon(tm)”, I suspect the controller chips can’t be far off either.