FSR 4 may be a simple upgrade for FSR 3.1 games according to leaks, which hopefully means we won't see a repeat of FSR 3's poorly-supported launch
So, an "upgrade feature." That certainly sounds like some form of integrated backwards compatibility to me, although it's ...
AMD FSR 4 “should just work” with existing FSR 3.1 games, leaker suggests
It's reportedly possible to automatically add FSR 4 support to existing FSR 3.1 games for new AMD Radeon RX 9070 gaming GPUs ...
AMD’s FSR 4 could be a day-one upgrade for FSR 3.1 games
New AMD graphics cards are on the way, arriving sometime in the next couple of months, and they’ll be packing an upgrade to ...