Perhaps Microsoft will not miss this opportunity and include one in the upcoming machine. With the release of the Surface Pro, the 2-in-1 came with a lot of missed opportunities and this included the lack of a very versatile port called Thunderbolt 3.
Or in other words, using the Thunderbolt 4 dock in USB-C fallback mode cuts your effective video bandwith in half (for the benefit of having USB 3.0 speeds for pheriphals.)īottom line: Either connect to your Dell monitor directly for 4K 60Hz and have some patience when copying data at USB 2.0 speeds or buy the Surface dock / Surface dock 2 which will give you 4K 60Hz with USB 3.Microsoft has a lot of products in the works and one of them that is going to be receiving a lot of attention is none other than the Surface Pro 6. When a Thunderbolt 4 dock runs in USB-C Fallback mode, it only utilizes 2 high speed lanes for Displayport traffic, capping older HBR2/DP1.2 systems to Surface devices based on Intel 10Gen theoretically have USB-C HBR3/DP1.4 capability "on paper", however due to some faulty or missing DSC implementation (?) they fall back to HBR2/DP1.2 when connected to newer docks that would support it, I've just tested a Surface Laptop 3 a few days ago to see if Intel's latest drivers may eventually have fixed that (nope.) Monitor 4k + Webcam 1080p > USB-C > Thunderbolt 4 dock > Thunderbolt 4 cable > Surface Book 3 - suddenly monitor responds very slow at 30hz
Thats because your HBR2/DP1.2 compliant monitor is natively using all 4 high speed lanes for displayport traffic, about any laptop with USB-C alternate mode capability will be able to ouput 4K 60Hz to this monitor TL DR: Should Surface Book 3 work good with Thunderbolt 4 dock? (I know the throughput will be as capable as USB-C 3.1 spec allows). So net net, is there an issue with SB3 USB-C port and TB4 comaptibility? I thought TB4 is just backward compatible to USB-C hence all USB-C peripherals should work normally. Monitor 4k + Webcam 1080p > USB-C > Thunderbolt 4 dock > Thunderbolt 4 cable > Macbook - works perfectly Initially I thought my dock is the problem but everything works perfectly with my MacBook which has TB4 port.ģ. Monitor 4k + Webcam 1080p > USB-C > Thunderbolt 4 dock > Thunderbolt 4 cable > Surface Book 3 - suddenly monitor responds very slow at 30hz and visible delay in mouse/window dragging Monitor 4k + Webcam 1080p > USB-C > Surface book 3 - works perfectly It works perfectly but when I added Thunderbolt 4 dock then suddenly my screen got a big delay and only 30hz max refresh rate (down from 60). Right now I have only 4k Dell P2721Q monitor & 1080p cam plugged in to the monitor itself and then a single USB-C cable goes to my Surface Book. I chose TB4 because it's future proof and the price difference between good TB3/TB4 and USB-C docks was minimal. I've recently purchased thunderbolt 4 dock because I often switch devices so I like to have all plugged via single cable.
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