It turns out to be a very interesting problem
ASUS Armoury Crate Flickering RGB/ARGB – FIXED
When I first built my PC, I noticed that the blue LED lights for the fans in my case were pulsing when they should be emitting a constant beam of light. I couldn’t figure out what the problem was, and it didn’t seem to be affecting performance, so I left it alone for a while.
Recently the flickering became more intense and I thought it would finally be worth looking into. The results turned out to be very interesting and I found a few possible reasons for the problem and their respective solutions.
The most common problem with LED fan lights flickering is a driver issue that can be easily fixed. If all fans on the motherboard are flickering in the same way, there may be a problem with the motherboard and its software.