I think you won't find anything higher as it would need to have additional power and most sff PSU's won't give as much juice.
at 75W of power 1050 TI is strongest one without juice cables. Also heat problem is a major drawback.
have you seen zotac MAGNUS EK71080 ? I think they made custom water cooling to insert 1080 inside this little monster.
update:
looks like they did not, but laptop(low power) i7 + a lot of magic done here.