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4k 60hz not working with CAC-2070 (DP 1.2 to HDMI2) on hd7850

Updated on 17-12-2020 in Adapters and Cables
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2 on 30-11-2020

Hello, I have hd7850 connected to a 4k 60hz tv using CAC-2070 and hdmi2.0 cable, unfortunately it seems I can’t get 4k 60hz, the best I can get is 4k 30hz.

I have the latest amd drivers.

I tried clean driver installation and custom resolution and it doesn’t work

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yonish 0 on 03-12-2020

After some research I managed to fix it and configure 4k 60hz on hd7850 with CAC-2070, So for anyone following this – the fix will probably work on any GCN card, like hd7970, r9 290x, r9 390, etc.

So it turned out that AMD removed the driver support for the Active Adapter (DisplayPort to HDMI2) when they released Adrenalin, so basically the last version that supports 4k 60hz via Active Adapter (DP to HDMI2) is Radeon Software Crimson Edition 16.8.3, basically all you have to do is uninstall adrenalin driver, and simply install Crimson 16.8.3 instead.

you can download Crimson from AMD’s website: https://www.amd.com/en/support/kb/release-notes/rn-rad-win-16-8-3

  • Don’t forget to uncheck the box that automatically updates the driver

Club3d support – if you’re reading this – your description in CAC-2070 page is misleading, please specify that 4k 60hz will only work with Crimson 16.8.3 driver when using GCN cards.

Good luck!

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Baak 0 on 17-12-2020

Your card is 8 years old. AMD changing the drivers after 8 years is that really intentional misleading text from Club-3D?

Good to read you fixed it tho 🙂

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