Neither my TXs or 290Xs throttled on air, all that is needed is to use a custom profile.
Having said that the TXs are far easier to keep below their thermal limit than the 290Xs and the NVidia cards are far quieter too.
None of this has anything to do with the 980 Ti owner thread though.
Well the fact you had to use a custom fan profile is something imo that shouldn't be. Regardless of how loud it is or how much it downclocks, if the nvidia stock fan profile can't keep the card from throttling then its something that needs addressed.
Only mentioned it in here as its the first time ive seen people saying their tx's throttled.