Thought this was interesting on the gsync module, from pcmonitorsinfo:
It’s still a bit better on the Nvidia side than AMD side, but both are just fine really and a big improvement over previous firmware versions. I still have an affinity to the ‘DW’ due to the other benefits I mentioned on the first page of this thread – related to the G-SYNC module (lower VRR flickering, seamless operation throughout VRR range and less ‘micro stuttering’).
The issue with what could broadly be called ‘VRR flickering’ can manifest in various ways. It can be caused by a panel’s sensitivity to the voltage fluctuations that occur when the refresh rate changes, particularly large changes that would occur for example when the LFC boundary is crossed. VA models are usually particularly prone to this. Very occasionally IPS models will have this issue, but it’s rare. G-SYNC modules offer more careful voltage regulation and tighter tuning and will generally eliminate this form of VRR flickering with any panel type. It can also be caused, to a more minor degree in most cases, by slight shifts in gamma as refresh rate changes in a VRR environment. These shifts usually occur for darker to medium-dark shades when significant fluctuations occur and can even be observed on OLED models – for example, this occurs on the Dell Alienware AW3423DW even though it has a G-SYNC module. Most IPS models are free from this sort of VRR flickering as well.