If you want to use frame gen then yes it's currently a 40 series exclusive, which may or may not be an issue if non 40 series cards cannot maintain decent fps with just DLSS Super Resolution (DLSS2 without frame gen).
I think we will have to resort to using DLSS 2 in Performance mode to get half decent fps in this with PT enabled on non 40 series cards at 1440p and lower some other settings maybe. AMD cards may want to skip the update altogether
I might try upping my resolution to 5120x2160 and then using Ultra Performance to see how that looks. Never tried Ultra Performance before