I bought one of these awhile back from zipzoomfly actually, not sure what it does over stock since this one went right in, but it keeps my q9450 at or below 41 Celsius even under sustained full load. that being said zipzoom fly has horrible customer support when they say that pictures are for fits and giggles and not meant to represent the product that the picture is supposed to be of they mean it consequently the same seem sto go for the product descriptions as well. they will not work with you. they will not pay return shipping when they screw up and they will hang up on you at least 10 times and take at least 45 minutes to locate a manager. I will never order form them again but this is a good product at a really good price mine has been running strong for 2 years now.