My fan is making a grinding noise

[RyanHeights]

I have a expensive gaming pc i put together myself & everytime i start a game it will be fine for a while then my fans will speed up & one of my fans makes a grinding noise it's weird was wondering what's causing it there's nothing in it's way no wires or anything

 

[CountMike]

They speed up with heat generated when parts are running at higher speeds, that's normal but grinding can come only if fan's bearings are bad.

 

[RyanHeights]

They speed up with heat generated when parts are running at higher speeds, that's normal but grinding can come only if fan's bearings are bad.

 

[RyanHeights]

Thanks man Yeah i changed it out haven't had a problem since