Custom Resolution Utility (CRU)

[jarkid]

Dear ToastyX,

I have been using CRU, and I think it's an excellent tool, because it've helped me to resolve a persecution.

After that, I still have a question that I hope you could help to answer.

I've encountered an issue few weeks ago that when my monitor is set to 75 Hz refresh rate in default, the whole screen flickers(like a lightning within a second) sometimes with BlueStacks running a specific game(In other situations, it's fine).

I have tried different ways to solve this issue including re-installing Windows, drivers, different AMD settings, and even changing a new HDMI cable, it's all useless.

The only way making an impact is to set the screen to 60 Hz, it's okay without flickering. I was thinking the 75 Hz is unstable because the refresh rate is from overclocking.

Then I used CRU to create a setting of 70 Hz(lower RR for trial) with LCD Standard, it's so fine like the setting of 60 Hz. Then I created another "76" Hz with LCD Standard to try. What surprised me is that it's also fine like other good settings.

So I was wondering what happened to the default setting of 75hz?

Then I used CRU to check the setting of 75 Hz out, it showed me that the 75 Hz uses "LCD reduced" setting, and the setting of 60 Hz uses "LCD Standard". So I think this is the cause.

Because when I use the LCD Standard, the screen wouldn't flicker. But when I use LCD reduced, the screen would flicker sometimes.

Could you please tell me
1. What's the probable reason that "LCD reduced" would make my screen to flicker?
2. Why does the default setting of 75 Hz use "LCD reduced" as I see in CRU? It's made by Windows or my monitor manufacturer?
Thanks a lot !!!

My screen: Philips 221V8A
My CPU: R5 5600X
My GPU: ASUS ROG RX 570 4GB

the good setting: https://i.imgur.com/q9gDoBB.png
the setting with issue: https://i.imgur.com/tGq7x0v.png