Intel pixel clock patcher?

In light of the very very long-awaited Intel driver update that enables EDID overrides, I have managed to overclock my laptop's internal display to 100Hz @ 1366x768. Unfortunately, any resolution going over a 120MHz pixel clock refuses to show up, which, as some other people mentioned, might signify some sort of hard limit (some with 1080P panels claim to be limited to 240MHz).

As far as I know my laptop's display uses eDP - I've tried doing some research on its limitations but didn't really find much. 240MHz seems like a reasonable hardware limit but could some inferior (only 120MHz) hardware have been used since I only have a 768P screen? (Probably a silly question but I'm new to this stuff.)

Does anyone know what's really going on here? Is it an impassable hardware limitation or some sort of software/driver one that can be patched away as it's been done for AMD/Nvidia chips?

Edit: Adding some other info that might be relevant -
Laptop is an Asus X550JX, Haswell CPU - Intel HD 4600, a GTX 950M as dedicated GPU. Successfully used CRU to overclock, tried the Nvidia pixel clock patcher and surprisingly and apparently it found all of the limits and patched them - doubt it did anything as I've yet to restart and check.