Let me do the thinking.
Anyone 1080ti 300w 40C?
I think after 3 pages now, you should know the answer is no.
If you are asking for permission, then please understand that you don't need our permission. Just try it and let us know how it goes.
If you are asking for validation, then no miner is going to approve because of the sunken cooling and power costs you will incur in your attempts to hit 300W @40C. No one believes its worth the effort for the small gains you would see.