Gpu temp issues

[Jdtnk]

Hello, i currently have a zotac gtx 1080ti amp but i am experiencing temperature throttling at stock settings, i have underclocked it a bit to slow it down from hitting the temp limit so quick, would a nzxt g12 and a 140mm rad be enough to try and cool it down?

Thanks for any replies, jake.

 

[Jdtnk]

At idle its about 36-40°c as i have it set to about 60% fan speed and underload its set to around 80% fan speed with the side panel removed but the shroud sounds like its going to rattle off and the temps under load peak at 84°c with the temp limit slider at 84°c it can go up to 90°c but it will still hit that limit