small pic for bensam...

once on the 1070 was maybe bad luck, twice in a year on my two Strix... its not (same 3rd fan failing)
and for sure, this third one is directly connected to the card with a lot of wires
sleeve bearing = quiet, short lived, cheap
ball bearing = durable, loud, expensive
Simply put sleeve bearing is not good for >1 year of mining. You need have replacement ready every year. Sleeve bearing only makes sense for dorm mining even if you can find replacements.