Definitely not slower than 4090. There's always been this misconception that the 4090 is way faster than 4080, while in reality is in between 15% and 30%, depending on resolution.5-10% either side depending on the game/scenario. I think it'll be pretty close tbh.
Even 4k native RT, which is the worst case scenario for 4080 vs 4090, we're still talking 25%.
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