https://www.nvidia.com/en-us/geforce/graphics-cards/rtx-2080-super/
Go down to the specs and click the link, then look at the numbers and compare them with these.
https://www.nvidia.com/en-us/geforce/graphics-cards/rtx-2080/
It is ~5%-8% faster than the FE "A" chip. (look also at RTX Ops are these are directly related).
Even Gibbo said that both 2080 & 2080S heavily overclocked, the difference will be 10% at best.
The 2080S VRAM also is overclocked to it's limits out of the box.
Google overclockers 2080 super 25%, They said up to 25% but it looks no where near. No reviews and literally two days till launch.