Custom Resolution Utility (CRU)

[ToastyX]

That's an EDID limitation. The base EDID only has four slots that can be used for detailed timing descriptors. It's possible to add more through the use of extension blocks, but the program doesn't currently have that functionality. I plan to add the ability to create a custom extension block eventually, but not in the immediate future. It will be a while before I get around to it because of the work involved. I also have to figure out why NVIDIA's driver ignores custom resolutions when the extension block flag is set, but maybe that won't be a problem when a custom extension block is defined.