I bought this little guy to help keep cool a Radeon-style graphics card in my PC case from running too hot.
My graphics card itself didn't come equipped with a fan of its own, and on average it would run in the 63-70 degree Celsius range - although I've been told that this is still a safe temperature range for Radeon cards to operate within. I find that kind of odd, though.
This fan brought my card's temperature down from 70 to the 47-49 degree range within minutes after putting it in. Will definitely buy another fan like this one again, when it comes time for this one to be replaced - whenever that will be.