Never buy a fan that attaches to your PS3 or PS4, i found that it burns your system up. Instead get a small fan and place it behind the unit and it will cool it just fine. I just gave my Grandson Dustin my 6 year old PS3 it still works great...
Just a heads up.. I had an intercooler attached to my first ps3 and it burned up. On the second one i put a fan behind the system and it never over heated. I just gave it to my grandson after having it for six years and it still works fine. I am doing the same with my new ps4. Bill2208