@utabintarbo,
AMD's heat spreader will work well, for air cooling. For good watercooling it will almost certainly do more harm than good.
@ben,
Actually, increasing the thickness outside the core area may not be bad. Yeah, more thickness normally means more resistance, be delta-T is not a function of resistance alone. Delta-T is resistance and heat flux. Outside the core, heat flux drops dramatically. The fins outside the core will not get rid of as much heat because most of the heat gets handled directly over the core. For a given amount of heat and a given distance to travel, the delta-T in that material will be inversely related to cross sectional area. Translation, more material means lower delta-T.
Over the core it is a different situation where the distance to travel is the material thickness. Outside the core, the distance to travel is roughly the square root of the thickness^2 + radial distance^2. As you get farther from the core, the "thickness" portion takes on less meaning in determining distance. For radial heat dispersion, thickness is proportional to cross sectional area meaning that resistance is inversely related to thickness.
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