Comparing Midjourney Image Upscaling Speeds: Gigapixel 8 Performance on RTX 4070 Ti vs. Newer GPUs

Upscaling 4x my Midjourney images in Gigapixel 8 with the Redefine generative model takes about 2 minutes (creativity @3 and no advanced settings). I have a geforce rtx 4070ti. How much faster would this process be on better graphics cards? Especially on new RTX 50 series? I’m thinking is it worth an upgrade