BigRock: Spire 5T060B1H3R
The larger Rock has a base surface of 64 by 74 millimeters. The base plate is nine millimeters thick in the center and tapers off towards the edges, to increase to an impressive fifteen millimeters at the edges (in the shape of waves).
The surface of the BigRock's base plate seems smoother than that of the BigRockII.
The profile of the fins varies in relation to the thickness of the base plate - the fins are thickest in the middle of the cooler (above the die) and on the edges.
Cooler: the temperature level below the 5T060B1H3R is significantly lower than that below the 5T061B1H3T.
The cooling capacity reflects that fact and is enough to keep at least an Athlon XP1800+ cool.