OCC has published a review on the Thermaltake Silent 1156

Testing of the Silent 1156 reveals that it provides a reduction in temperatures when compared to the stock Intel cooling solution by 8 degrees Celsius at stock speeds and 12 degrees with a modest overclock. When compared to the rest of the field, it is not the highest performer, but does excel at doing its job with a low noise signature.

Thermaltake Silent 1156 Review