[joevt]

I got a new firmware (5.04.135) from Delock for the Delock 87737 and successfully applied it using fwupdtool so now it supports three 4K 60Hz 8bpc RGB displays. That’s approximately 39 Gbps but DisplayPort 1.4 can only do 25.92 Gbps which means DSC input and output decompression are now working.

[joevt]

For HDMI 2.1 to DisplayPort 1.4 (or USB-C):
https://insights.club-3d.com/thread/hdmi-2-1-to-usb-c-displayport-1-4-alt-mode/

For DisplayPort 1.4 (or USB-C) to HDMI 2.1:
https://insights.club-3d.com/thread/usb4-to-hdmi-2-1/

 

[joevt]

For HDMI 2.1 to DisplayPort 1.4 (or USB-C):
https://insights.club-3d.com/thread/hdmi-2-1-to-usb-c-displayport-1-4-alt-mode/

For DisplayPort 1.4 (or USB-C) to HDMI 2.1:
https://insights.club-3d.com/thread/usb4-to-hdmi-2-1/

 

[joevt]

For HDMI 2.1 to DisplayPort 1.4 (or USB-C):
https://insights.club-3d.com/thread/hdmi-2-1-to-usb-c-displayport-1-4-alt-mode/

For DisplayPort 1.4 (or USB-C) to HDMI 2.1:
https://insights.club-3d.com/thread/usb4-to-hdmi-2-1/

 

[joevt]

For HDMI 2.1 to DisplayPort 1.4 (or USB-C):
https://insights.club-3d.com/thread/hdmi-2-1-to-usb-c-displayport-1-4-alt-mode/

For DisplayPort 1.4 (or USB-C) to HDMI 2.1:
https://insights.club-3d.com/thread/usb4-to-hdmi-2-1/

 

[joevt]

The CAC-1331 (and probably CAC-1332) can do 1080p 120Hz just fine. It can probably do 1080p 230Hz but my display doesn’t go beyond 144Hz.

For HDMI 2.1 to DisplayPort 1.4 (or USB-C):
https://insights.club-3d.com/thread/hdmi-2-1-to-usb-c-displayport-1-4-alt-mode/

For DisplayPort 1.4 (or USB-C) to HDMI 2.1:
https://insights.club-3d.com/thread/usb4-to-hdmi-2-1/

 

[joevt]

I made a new thread for HDMI 2.1 to DisplayPort 1.4 since this thread is mostly discussing DisplayPort 1.4 to HDMI 2.1.

For HDMI 2.1 to DisplayPort 1.4 (or USB-C):
https://insights.club-3d.com/thread/hdmi-2-1-to-usb-c-displayport-1-4-alt-mode/

For DisplayPort 1.4 (or USB-C) to HDMI 2.1:
https://insights.club-3d.com/thread/usb4-to-hdmi-2-1/

 

[joevt]

The CAC-1085 is a DisplayPort 1.4 to HDMI 2.1 adapter. For USB-C to HDMI 2.1 see https://insights.club-3d.com/thread/usb4-to-hdmi-2-1/

[joevt]

The CAC-1085 is a DisplayPort 1.4 to HDMI 2.1 adapter. For USB-C to HDMI 2.1 see https://insights.club-3d.com/thread/usb4-to-hdmi-2-1/

[joevt]

The CAC-1085 is a DisplayPort 1.4 to HDMI 2.1 adapter. For USB-C to HDMI 2.1 see https://insights.club-3d.com/thread/usb4-to-hdmi-2-1/

[joevt]

The CAC-1085 is a DisplayPort 1.4 to HDMI 2.1 adapter. For USB-C to HDMI 2.1 see https://insights.club-3d.com/thread/usb4-to-hdmi-2-1/

[joevt]

The CAC-1085 is a DisplayPort 1.4 to HDMI 2.1 adapter. For USB-C to HDMI 2.1 see https://insights.club-3d.com/thread/usb4-to-hdmi-2-1/

[joevt]

Same question at https://insights.club-3d.com/thread/usb-type-c-to-hdmi-2-1/

 

[joevt]

You could use the CAC-1085 with a CAC-1567 but a direct USB-C connection would be preferable. Cable Matters has a USB-C to HDMI 2.1 Adapter. Product ID 201388. It’s basically a USB-C version of the CAC-1085 so it probably uses the same Realtek chip. It’s more convenient because it gets power from USB-C (like Club 3D’s USB-C to Dual Link DVI adapters) so it doesn’t need a separate USB power connection like the CAC-1085 does.

In either case, I don’t know how well they work with the M1 Mac. DSC is require for bandwidth greater than 25.92 Gbps. Bandwidth is pixel clock x bits per pixel. DSC might not be working properly in macOS Big Sur in some situations.

https://www.club-3d.com/en/detail/2487/usb_type_c_to_displayport_1.4_8k60hz_hbr3_active_adapter/

https://www.club-3d.com/en/detail/2496/displayport_1.4_to_hdmi_4k120hz_hdr_active_adapter_m-f/

https://www.cablematters.com/pc-1368-122-usb-c-to-8k-hdmi-adapter.aspx

https://kb.cablematters.com/index.php?View=entry&EntryID=136

https://www.anandtech.com/show/14535/realtek-demonstrates-rtd2173-displayport-14-to-hdmi-21-converter

 

[joevt]

Did you connect the USB connector of the CAC-1332? Maybe it’s not getting enough power. Can you connect the USB connector of the CAC-1332 to a dock or hub?

Are you using a USB-C cable with the CAC-1332? Maybe it doesn’t work with a Thunderbolt cable.

When the Mac mini detects a display, it will appear in the Displays system preferences panel. If it doesn’t appear there, then you cannot test different resolutions.

If the display can get detected, there probably will not be a 5K option, since the LG UltraFine 5K display does not have a single tile 5K option in its EDID and there’s no way on M1 Macs to create a custom timing like on Intel Macs.

For firmware update, I guess you need to ask Club-3D tech support if the adapter is supposed to be able to do width greater than 4K or not. If they say it should be able to do width 5K, and your adapter cannot (like mine), then maybe there’s a firmware update.

Club-3D doesn’t say what chip is used. SIIG and Delock have similar adapters that use the LT6711A. It has some USB-C specific features, so maybe that means the CAC-1331 uses a different chip? Anyway, the info for the LT6711A doesn’t say it supports 5K width.

The Lontium website at http://www.lontiumsemi.com/product/list_1849.html has a LT6711GX which can convert HDMI 2.1 to DisplayPort 1.4 with USB-C. It works with DVI1.0, HDMI 1.4 – 2.0b (18 Gbps) and HDMI 2.1 (32 Gbps). It supports resolutions up to 8K 30Hz (or 8K 60Hz with DSC). So I guess if the LT6711 can’t do 5K width, then maybe the LT6711GX can do it.

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