Force 4K in Windows 7 (wrong max resolution reported by the TV)

Solution 1:

I finally found a way to achieve this. Here's how to do it :

First, you need to patch the HDMI Pixel Clock on the card with this utility : http://www.monitortests.com/forum/Thread-AMD-ATI-Pixel-Clock-Patcher

Then, once it's done and the computer has been rebooted, you use Custom Resolution Utility (http://www.monitortests.com/forum/Thread-Custom-Resolution-Utility-CRU) to add the desired resolution to the available resolutions list.

I'm not sure if a reboot is necessary here, but then I was able to see the 3840x2160 resolution in the Windows display settings!

Solution 2:

I cannot leave comments yet but the previous answer by Samuel Bolduc worked for me twice. Once about four months ago and again today. Every time an update comes form AMD I lose my 4K resolution. The following link provided by Samuel worked. http://www.monitortests.com/forum/Thread-AMD-ATI-Pixel-Clock-Patcher

That being said, my Norton 360 flagged it as harmful and removed it the second time. Not sure why the difference. Luckily I had the old file in my Recycle Bin and it worked. Same exact file as far as I can tell but Norton removed it the second time and not the restored file from my recycle bin.

I had to reboot but after that it worked and the 3840 x 2160 resolution option was back in Windows Settings.

I am using an AMD HD 6900 video card. Ironically the AMD Catylist Control Center still does not provide the higher resolution options but the Windows display settings do so that worked.

Solution 3:

The accepted answer is correct. My desktop computer's graphics are driven by an AMD Radeon HD 5850 graphics card (no integrated graphics (CPU is an i7 860)). When I recently bought a 4k monitor, I thought I would only be able to run at 1080p resolution but following the instruction in that answer (on Windows 10), I am now able to use the 4k monitor at its native 3840 by 2160 resolution without any issues (I am not gaming on it obviously; 4k video playback is fine). This is contrary to max resolution specified on AMD's official specifications for the card.