Thanks @BradtheRad,
(Fan is placed over the Heatsink.)
I have done it, and I checked the temperature at least 3 hours and it is in normal range(45 Celsius), I played high graphics games and temperature is just 50 Celsius.
With original broken Fan it had 65 Celsius during normal usage, it works for me perfectly!
Nvidia(Manufacturer) say, 60 to 85 Celsius is Normal temperature for Graphic cards.
sorry, I don't know whether or not fan is controlled by a thermal sensor, but it is 2-Wire fan.