I have these fans in a double gained as one of the fans of my graphic card cooler (Arctic Cooling Twin Turbo Pro) has given up the ghost and I desperately needed replacement. The 30 for a new radiator, I did not spend, therefore I have decided for this still relatively cheap way. Did so with cable ties and some fumbling at the heat sink attached and have to say that I am very happy with the result. Temperatures are once again fallen by about 3 degrees compared to the Arctic Cooling fans (before they gave lawnmower similar noises). My ATI Radeon HD 4870 1GB is now running at idle and under full load at 52 ° to 68 ° - these are values on which one can hardly complain at this flamethrower of graphics card. The noise level I find them to be very low.
So who needs a small fan model, will be happy with these fans. That they do not the same with 12mm depth air flow have such deep 25mm fan with the same revolutions / min, each case should be clear and the value you can not complain definitely.