X-bit Labs has published a roundup of sixteen thermal interfaces from various brands, you can check it out over here. They tested the efficiency of these compounds not only on an overclocked processor, but also on a GPU.
Now that we decided to check out a number of new thermal interfaces as well as some of the very well familiar ones, we discovered that last time we discussed this topic was over two years ago. It is unacceptably long for high-tech industry. There appeared about a dozen new thermal interfaces in the market since then, so altogether we are going to talk about 16 thermal compounds differing in efficiency as well as price.
The reporter concludes the good old Arctic Silver 5 is still pretty good, but that it now has about eight worthy competitors, including the liquid metal compounds from Coollaboratory and the OCZ Freezer Extreme.