Dogbert – are you thinking of project cars?
That will be on both plus pc and steam OS as well.
As for pc, my approx £1000 pc that I built around Xmas will be able to run watch dogs at 60fps 1080p on high settings but I think it would struggle to run everything on ultra!
I’m still working my way through the games I collected in the last steam sale, but plan to get a ps4 later this year when there is more game choice and I have more time to play hopefully!