You can even use newer ones, you only have to look for the distances of the holes of the cooler (dont know the word for that in english ). It should be the same like my GF6200, its ~53mm.
I uploaded a CPU-Z-result ( http://hwbot.org/result.do?resultId=937912 ) and it says that this one doesnt count because iits my best result, but i only have another CPU-Z-result with another processor. I just want my 0.1 pts