Got that one too. It was cheaper then the WD version. As far as I understand, the normal version would not have the WiFi card and its probably not showing up as a network device when the host is disconnected (to be remotely managed and self-update). So possibly, the idle power consumption of the WD variant would be lower, but it seems to not “do“ much until its configured to do stuff.
I was very curious that its using a Realtek USB3 2.5G ethernet controller, despite also having an Intel PCIe 2.5G controller and drivers. Seems like it will only switch to the PCIe controller on specific professional laptops from Dell for even more remote management functions of the notebooks.
The Intel USB4 controller can do UHBR10 and UHBR20 (not UHBR13.5). The MST Hub is a Synaptics VMM9430, which can do UHBR20. They don’t say much about lower speeds, but I’d assume that includes UHBR13.5. So, TB outs can do UHBR10+UHBR20, the DP (incl. DP Alt port) should do everything up to UHBR20.
With my Strix Point FW, I managed to test 2xUHBR10 and 4xUHBR10 host connections.
Well, the USB4v1 standard and all Frameworks to date only support max. DP 1.4 in terms of tunneling through USB4. So our hosts are limited to max 4xHBR3 per DP tunnel (even though some of them already support some UHBR speeds for native output out of the same ports).
Newer controllers could use the UHBR speeds (although not much use of that on a 40G USB4 connection) as long as the bandwidth fits, which can get very complex for USB4.
The TB5 / USB4 80G controller in the dock (the only one so far) can do 3 DP tunnels in any which combination that is not UHBR13.5. Rest depends on the host’s decisions.
Our hosts also only do 2 DP tunnels. And because of the way MST is handled, if that is in use, it will get the highest supported speed connection. So typically, we would loose a 4xHBR3 connection to the MST Hub and then what little remains (in 40G) could be used for a 4xHBR1 connection out of any of the TB outs.
With a host maxing out the features, it would probably go into 120G/40G mode and use a 4xUHBR20 tunnel to the MST hub. With probably enough bandwidth left over to do another 4xHBR3 or 2 4xHBR2 connections out of the TB ports.
But any host that can do that, may also be smarter about bandwidth allocation, where GPU and USB4 driver coordinate. Then they can be lots more flexible.