https://www.techspot.com/article/1779-freesync-and-nvidia-geforce/FYI...….
If not already known, Nvidia has now provided the ability for their graphics cards to actually work w\ FreeSynch monitors (better known as VESA Adaptive Synch which is the actual open source VRR standard coding by which AMD had a big hand in developing & always used....
in conjunction w\ Nvidia as well as others such as Intel for starters, only Nvidia decided to use this same coding tweaked thru their proprietary monitor module in their graphics drivers....until recently) w\ their latest generation of drivers. The only question is how far backwards in GPU generations will they allow & the only other real requirement outside of using the proper drivers for the Nvidia vid card is that you have to use a DisplayPort cable w\ a FreeSynch monitor that is equipped w\ a DisplayPort connection...…….whereas w\ AMD you can use either HDMI or DisplayPort monitor connection.
Nvidia has muddied the waters on their vid card GPU's ability to use FreeSynch….they will pretty much work w\ most of the AMD "FreeSynch" branded monitors out there but Nvidia will only "guarantee" a few of them to work, namely the latest FreeSynch 2 & FreeSynch HDR equipped monitors. The base VESA Adaptive Synch open standard coding hasn't changed much at all over the years so the only items that technically won't work are any features outside of the VESA base standard that aren't supported either in the vid card drivers or in the monitor drivers (such as HDR or LFC), but not the base VESA Adaptive Synch open standard code (which is the base coding of all the AMD FreeSynch monitors)…..or any features that Nvidia decides to impose "restrictions" to access thru their vid card drivers, NOT due to the VESA open monitor coding standard, to "direct" users to the few monitors that they want you to use.
The same thing goes for any AMD vid cards as well, just that AMD
wants users to use this w\ all their graphics cards. For example, my Radeon RX Vega 64 vid card can run any of the FreeSynch monitors on the market including the latest units that support HDR & LFC but I don't have either of those features as my monitor is 1st gen FreeSynch. Asus says my MG279Q monitor can only support as high as 90Hz RR using FreeSynch but in reality it's hardware can actually support FreeSynch at my monitor's
native 144Hz refresh, only Asus hasn't\won't provide a proper driver to unlock it. I've had access to a hacked driver that would get around this limitation but you have to deal w\ all the false warnings that was coded into the monitor's hardware when the RR exceeded the 90Hz "imposed" limit. Since then AMD has rectified this themselves by finally properly implementing Enhanced Synch in the vid card drivers which will allow the vid card to run as fast as the monitor's native RR w\o tearing BUT STILL use the very same 1st gen FreeSynch coding in my monitor if the RR happens to drop below the 90Hz limit...….
But the card has NO issues running & using 1st gen FreeSynch as my monitor is using the same VESA Adaptive Synch open standard coding that AMD branded under the "FreeSynch" brand name for their marketing purposes.
The very same open VRR coding that Nvidia helped develop AND is now allowing their vid card GPU's to use thru their drivers...………