The great thing about Intel's laminar coolers is that you can take the fan off by removing 4 screws --
Here I have it attached on the motherboard after removing the fan.
Now you can attach a much more powerful fan on it by using hot glue on the plastic clips (4 in no.; the thing that fixes the heat sink to the motherboard). If you wish to attach a smaller fan, you can stick it directly to the copper heat sink.
Hot glue sticks are good enough for the purpose and is easy to take off when the need arises. Here is the result --
Here I have a 92mm PWM server fan attached on the heat sink.
This resulted in 5 degree lower temps.