LG Ultrafine 5K+1080Ti=Awful Performance (Game Benchmarks)  

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Eminent Member
Joined:9 months  ago
Posts: 26
June 14, 2018 8:59 am  
Posted by: Eightarmedpet

Holy cow that’s a lot of links. 
I think I remember these being discussed and they wouldn’t work as they are not bi directional, maybe?

Correct. A Thunderbolt 3 controller has the following interfaces/connections/pins/ports (whatever you want to call them):

  • PCIe (PCIe 3.0 x4 but some computers might only use x2)
  • DisplayPort 1.2 Input 1 (also HDMI 1.4)
  • DisplayPort 1.2 Input 2 (also HDMI 1.4)
  • Thunderbolt Port 1 (input or output, DisplayPort 1.2 or HDMI 1.4 output, USB 3.1 gen 2 host)
  • Thunderbolt Port 2 (ditto)
  • DisplayPort Output (also HDMI 1.4)

The Thunderbolt 3 to Dual DisplayPort adapters are wired something like this:

  • Thunderbolt Port 1: Thunderbolt Input
  • Thunderbolt Port 2: DisplayPort Output 1
  • DisplayPort Output: DisplayPort Output 2

What we need is:

  • DisplayPort Input 1
  • DisplayPort Input 2
  • Thunderbolt Port 1: Thunderbolt Output

The only thing matching this description is a Thunderbolt 3 add-in card like the GC-ALPINE RIDGE, the ASRock Thunderbolt 3 AIC, or the MSI Thunderbolt M3 (the MSI doesn't exist). All add-in cards use the PCIe connection of the Thunderbolt 3 controller. The GC-ALPINE RIDGE also uses the DisplayPort Output of the Thunderbolt 3 controller as an HDMI Output (all the DisplayPort ports support DP++ dual mode HDMI 1.4). The three listed add-in cards have two Thunderbolt 3 Ports. The DisplayPorts are mini (GC), full-sized (MSI), or mixed (ASRock). The ASUS ThunderboltEX 3 only has one DisplayPort input (full-sized) and the second Thunderbolt 3 output is wired as a USB-A port supporting USB 3.1 gen 2.

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