How do you find the limit of your monitor?

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A guide on Youtube would direct me to raise the laptop's monitor's Hz by 5 Hz at a time. After slowly raising and playing around with the timings, I managed to increase from 60 Hz to 105 Hz.

After half a year, I would finally take notice of Nvidia Pixel Clock Patcher. I'm thinking it would make sense for me to use it because the monitor turns blank when trying to make the pixel clock go above 240 MHz. Could this be a pixel clock limit? After checking the Common Pixel Clock Limits, two match the 240 MHz limit:

2 Lanes, 270 MHz (HBR), 6 bpc limit
1 Lane, 540 MHz (HBR2), 6 bpc limit

How can I tell which one I have exactly? And can the Pixel Clock Patcher raise the limit of my laptop's monitor? I'm a little confused.