Runing your GPU fans at 100% will wear them out quickly.
https://www.youtube.com/watch?v=OeK0G-70zIU
If you're having to run your GPU fans at 100% it means the ambient temperature is too high from poor ventilation causing the heat in the room or case to build up. You should focus on ventilating the heat from the room. For 1-2 open air rigs, cracking open a door and a window will help. For larger setups you will have to pull the hot air out of the room using a vent fan so that it gets replaced with cooler air from another room or the outside. Laying some large case fans on top blowing outward or using inexpensive box fans can also help remove the heat from around the cards so the GPU fans don't need to run as high.
https://www.youtube.com/watch?v=OeK0G-70zIU
If you're having to run your GPU fans at 100% it means the ambient temperature is too high from poor ventilation causing the heat in the room or case to build up. You should focus on ventilating the heat from the room. For 1-2 open air rigs, cracking open a door and a window will help. For larger setups you will have to pull the hot air out of the room using a vent fan so that it gets replaced with cooler air from another room or the outside. Laying some large case fans on top blowing outward or using inexpensive box fans can also help remove the heat from around the cards so the GPU fans don't need to run as high.