These coolers are not for avant-garde overclocker's, nor were they designed with the overclocker in mind. I have read a few reviews on line where this product gets kicked in the proverbial nut sack for being crappy for overclocking, but why? It's not even made for that environment. The CM Sphere works much better that the stock Intel retail box heatsink, which works just fine for standard usage and also is not geared for overclocking. Under full load the copper version ran at just above 32C and the Jet black at 34C on the Intel and on the AMD system the copper ran at 38C and the Jet Black at 41C. The cooling fan is very silent and if noise is something you wish to avoid, the CM Sphere is something worthy of your consideration.