According to one of the Steam reviews, it ran horrible on RTX 4070 due to insufficient VRAM. The trailer shows FPS counter with 4x framegen, which is exclusive to 50xx series, also most likely relies on Nvidia upscaling. I wouldn't be too optimistic for AMD GPUs here
Doesn't directly answer your question as I don't have a modern AMD card to test with, but even with an RTX 5080 Super + 9800X3D, I was still only getting about ~45-55 FPS at 4K60. I left the default settings of High and DLSS enabled (Ultra was slower). Turning off DLSS tanked the FPS to like ~15-20 and ate up almost the full 16GB of VRAM.
Even so, it was still really cool to experience and was plenty playable as-is. I'm excited to see the full release.
I tried Portal RTX on a 9070 XT and got 20 FPS at full resolution (no frame generation). There’s no driver limitations, but I have no idea what the expected FPS is
I tested with an RX 7900 XTX on Fedora/Proton for ~5 minutes at the start of Ravenholm. My FPS counter was consistently over 50 once all the assets were loaded, but the image was extremely blurry. I don't know the cause and I couldn't find an obvious way to fix it. The framerate was fine, but the blur made it unplayable. I don't know if that issue translates to other AMD GPUs.