Will a 2017 iMac -> USB-C Digital AV Multiport Adapter -> HDMI to Dual-Link DVI-D adapter -> Apple Cinema HD 30" Display work at 2560 X 1600 at 60Hz?
Will a 2017 iMac connected to a USB-C Digital AV Multiport Adapter connected to an HDMI to Dual-Link DVI-D adapter connected to an Apple Cinema HD 30" Display work at 2560 X 1600 at 60Hz?
What about a Macbook Pro?
- Asked by fn from San Jose
USB-C Digital AV Multiport Adapter
Product No Longer Available
1 Answer from the Community
That will only work at 1280 x 800 60 Hz (Single Link, not Dual Link).
Many (or all) HDMI to Dual Link DVI-D adapters do not actually support Dual Link signals. The female Dual Link DVI-D connector of those adapters has a receptacle that accepts a Dual Link male cable (more pins than Single Link cable), but only the Single Link signal is passed (because HDMI is Single Link). They don't do any conversion at all.
You need a USB-C to mini DisplayPort female adapter. Then you can connect an Apple Mini DisplayPort to Dual-Link DVI Adapter. You can tell it's a real Dual-Link adapter because it requires extra power which it gets using a USB connection.
You could also use the mini DisplayPort output of a Thunderbolt 3 dock such as the OWC Thunderbolt 3 Dock.
Or you could use the mini DisplayPort output of a USB-C dock. Some support 4K 30 Hz and USB 3.0. Others may support 4K 60 Hz but only USB 2.0 (because USB-C is slower than Thunderbolt 3 so it can't support both 4K 60 Hz and USB 3.0). Either will work with 2560 x 1600 60 Hz.
The Thunderbolt 3 ports of the iMac and MacBook Pro support both USB-C docks and devices and Thunderbolt 3 docks and devices.
- Answered by Joseph V from Fort Langley