Do you have a NB aftermarket? A HR-05 with a 120mm fan pulling will draw more air to your cpu cooler, I also set my cpu to blow out top of case (900)instead of back. Got 5C less. BTW slot fans are usually noisier.
I have a fan on the stock NB cooler And it never go's over 30c
Really I always thought that big fan was to weak to Do anything lol