Hi everyone, I'm currently having issue with one of the fan of my 980ti g1 (Gigabyte): it's making a lot of noise and seems to wobble (it's not staying perfectly perpendicular to its rotation axis). Hence I'm looking to buy a replacement fan. From my google searches, reference for these fans is T128010SU. However, for this reference, I can see two different diameters: 75mm and 78mm. How is this possible? Which one should I take? Thank you!