Displayport 1.4 bandwidth drivers#

Windows drivers don't allow dual HBR3 at all. Apple's drivers won't allow dual HBR3 through an intermediate Thunderbolt device - the display needs to be connected directly to the Mac or Blackmagic eGPU. Similarly, a Thunderbolt display that uses a Titan Ridge controller can be connected to an intermediate Alpine Ridge device and get HBR3 (of course, the upstream source of the Thunderbolt DisplayPort stream still needs to be Titan Ridge).Īn Apple Pro Display XDR requires two HBR3 connections over a single Thunderbolt cable to get 6K 60Hz (the display has two tiles) when using a GPU that doesn't support DSC. If you connect a Titan Ridge device to the Alpine Ridge downstream Thunderbolt port, then the Titan Ridge can convert the Thunderbolt DisplayPort stream to HBR3. How much does the TB3 controller dock 'interpret' and how much does it slavishly copy?Īlpine Ridge can only output HBR2 (whether from downstream Thunderbolt port or DisplayPort).Īlpine Ridge can pass a Thunderbolt HBR3 stream from upstream Titan Ridge since it is just Thunderbolt packets.

Displayport 1.4 bandwidth full#

Do we expect the monitor to work at full resolution and frequency if plugged into a DisplayPort port on the dock? If monitor has a USB C input but not Thunderbolt input, would plugging that into the downstream port of the dock work? My understanding is the TB3 standard requires the downstream ports to work in DP alt mode (this answer corroborates) but I do not know about the DP version here. What's the compatibility expectation here? Let's take an Alpine Ridge based dock which is the majority of the market currently. I can't wrap my head around the Thunderbolt story, however. If we have a laptop with a DisplayPort 1.4 capable GPU and Titan Ridge and a 3440x1440 144 Hz monitor (which requires more DP bandwidth than DP 1.2 has) I would expect every USB C dock / adapter with a DisplayPort output to just work because all the dock needs to do is blindly connect the lanes in the USB C connection carrying DisplayPort signals to the DisplayPort outputs. I understand very well how this works in DisplayPort Alternate Mode: the host is told to switch into this alternate mode and from that point on, the cable is basically a DisplayPort cable with a different connector. Intel Titan Ridge controllers (and if I gather correctly, Ice Lake CPUs) are DisplayPort 1.4 and TB3 compatible ( Intel Ark).