Apple Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter — How many displays supported?

[Eric.chen3742]

These displays support daisy chaining, does that mean that only 1 adapter is needed for 2 TB displays chained together? Would a setup like MBP => adapter => display 1 => display 2 work, or would I need 2 separate adapters for a situation like this?

 

[joevt]

The adapter allows two Thunderbolt 10 Gbps channels for Thunderbolt 1 devices or one 20 Gbps channel for Thunderbolt 2/3/4 devices.

A 1440p Thunderbolt Display only requires < 8 Gbps of DisplayPort so in any case two displays should be supported unless the Mac is a M1 or M2 Mac that only supports one external display from Thunderbolt (please google to verify Apple Silicon compatibility).

The 1440p Thunderbolt Display is a Thunderbolt 1 device. One of the 10 Gbps channels is used for tunnelling DisplayPort. The other 10 Gbps channel is used for tunnelling PCIe for the Ethernet (1 Gbps), FireWire (0.8 Gbps), and USB (0.48 Gbps) controllers in the display. Chaining a second Thunderbolt Display to the first Thunderbolt Display uses ≈7 Gbps of the second 10 Gbps channel leaving < 3 Gbps to do PCIe for Ethernet/FireWire/USB but that's more than enough to not reduce their bandwidth.

 

[Eric.chen3742]

The adapter allows two Thunderbolt 10 Gbps channels for Thunderbolt 1 devices or one 20 Gbps channel for Thunderbolt 2/3/4 devices.

A 1440p Thunderbolt Display only requires < 8 Gbps of DisplayPort so in any case two displays should be supported unless the Mac is a M1 or M2 Mac that only supports one external display from Thunderbolt (please google to verify Apple Silicon compatibility).

The 1440p Thunderbolt Display is a Thunderbolt 1 device. One of the 10 Gbps channels is used for tunnelling DisplayPort. The other 10 Gbps channel is used for tunnelling PCIe for the Ethernet (1 Gbps), FireWire (0.8 Gbps), and USB (0.48 Gbps) controllers in the display. Chaining a second Thunderbolt Display to the first Thunderbolt Display uses ≈7 Gbps of the second 10 Gbps channel leaving < 3 Gbps to do PCIe for Ethernet/FireWire/USB but that's more than enough to not reduce their bandwidth.

Ah ok, thanks!