I'm betting a good quantum annealing machine could make meteorology a hard science. Now, wouldn't it be pretty awesome if the weather man/woman was right almost every single time.Protein folding calculations and modelling.
Meteorological and weather modelling and prediction.
Running the three body problem as a screen saver.
Run Crysis at high settings
(Is that still a thing? I am old.)
Make your own 3D UHD 8k pr0n at the fastest frame rate possiblewhat would you do that you can't do with an average computer though