changing the fans on Gigabyte GeForce GTX 650 Ti BOOST

madmax15

Distinguished
Nov 19, 2013
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I've had that card for 4 years or so, served me very well and still does however, one of the fans sounds like it's giving up, sometimes it makes some rattling sound, I think it's the bearing or something, it's also running slower than it's double next to it and it immediately stops turning when I turn off the computer and not slow down gradually like any normal fan, so what should I do?
here is a pic for the card to avoid confusion:

https://i.ytimg.com/vi/9vvS-C7EtRE/maxresdefault.jpg