Now go back and read what the program says in your screenshot.
do you mean that "program already tells it works with 1080/1080ti"?
If so, yes i can read.
since P104 is also with GDDR5X i just tried and give feedback.
Also in this article they said it is possible.
http://1stminingrig.com/gtx-1080-and-gtx-1080ti-hashrate-increase-up-to-55-mh-s-on-ethereum-ethashIt is thought that the tool changes RRD & FAW values (timings). Some users allegedly have made the same tweaks to p102 and p104 mining edition cards through other means. Moreover, there is a chance that the two mentioned card models wont work with this specific tool.