"As expected, all heat spreader types provided an improvement of a few MHz over the same module with no heat spreader applied. Within the heat spreader results, the XMS PRO provided a small performance gain over the XMS and Mesh heat spreaders. This is the result that we expected to see; the additional surface area provided by the larger heat spreader would naturally be expected to dissipate a nominal amount of additional heat...."
FULL STORY @ LEGITREVIEWS (http://www.legitreviews.com/article/299/1/)