TweakTown uses a different method for testing CPU heatsinks which allows for an even playing field across all product tests. We feel that by using the same ambient temperature and strict lab-like testing procedures we are able to accurately compare one product to another. More information on our testing procedure can be found in the T.E.C.C. article here.
I have to say that I am disappointed in the numbers of the Sphere here. With the large cooling area I was expecting to see numbers in the middle 50s, but here we are seeing low and upper 60 degrees.
There is nothing special on the acoustic level front either, but at least it is not disappointing. The load SPL of 61 takes the Sphere out of the HTPC ring as well.