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With or without hardware RT? (does Navi have it?). If not, it's a useless comparison anyway unless people really expect to avoid RT for the next few years. I'd not want to buy a card now without RT personally.
This Navi does not, this is a video on the best and arguably only decent implimentation of ray tracing, shows you with versus with and without and benchmarks with ray tracing turned on at Ultra:
So if you plan on implementing Ray Tracing with a 2070 going forward, you probably don't want to game above 1080p because the ray tracing completely throtles the 2070s performance. If you look at the 1440p performance you're looking at 30fps frames and that's going to get worse as newer titles become more demanding. So you either game with Ray tracing off at 1440p or drop to High or Medium Settings. What's better Ray Tracing on at Medium or off at Ultra? Look at the comparisons earlier in the video, you can see ray tracing provides a better lighting effect but there isn't allot in it. So it might be you get a better image with ray tracing off at ultra.
You could switch DLSS on at 4k ofcourse but this is going to significantly downgrade the image, probably much more of a downgrade than turning ray tracing off.
So will you get much of an advantage on an RTX 2070? Probably only if you intend on gaming at 1080p throughout that time or unless you're happy to turn other settings down at a higher resolution.