https://www.displayfusion.com/Discussions/RSS/?TopicID=0196835b-8c21-7063-a227-a83983f22d21 DisplayFusion RSS: can't enable 4th monitor rtx 4090 windows 11 Sat, 02 May 2026 09:16:26 GMT en hourly 1 https://www.displayfusion.com/Discussions/RSS/?TopicID=0196835b-8c21-7063-a227-a83983f22d21 https://www.displayfusion.com/Discussions/View/cant-enable-4th-monitor-rtx-4090-windows-11/?ID=0196835b-8c21-7063-a227-a83983f22d21#2 Thu, 01 May 2025 20:32:04 GMT Binary Fortress Software https://www.displayfusion.com/Discussions/View/cant-enable-4th-monitor-rtx-4090-windows-11/?ID=0196835b-8c21-7063-a227-a83983f22d21#2 DisplayFusion It sounds like you're hitting the maximum resolution supported by the card, I believe it caps out at 2x4K. DisplayFusion uses the Windows API to set the monitor configuration though, so if it's failing to apply in Windows it will fail to apply in DisplayFusion as well, there isn't anything we can do there unfortunately. ]]> https://www.displayfusion.com/Discussions/View/cant-enable-4th-monitor-rtx-4090-windows-11/?ID=0196835b-8c21-7063-a227-a83983f22d21 Tue, 29 Apr 2025 21:02:17 GMT Binary Fortress Software https://www.displayfusion.com/Discussions/View/cant-enable-4th-monitor-rtx-4090-windows-11/?ID=0196835b-8c21-7063-a227-a83983f22d21 DisplayFusion Hi,

I've got a PC with an rtx4090. It should in theory be able to support 4 monitors but currently I can't make that happen, either through the regular windows settings or DF. When I try to enable the 4th monitor it always just does nothing and then asks to revert or continue. the 4th monitor never changes, always stays black.

I can make any combination of 3 monitors work just fine, so each screen and its connection works indepedently, but can't have 4 in total.

Any idea what is going wrong here?

Thanks ]]>