"The SI-128SE is similar to the original SI-120. They share the same overall design, with a copper base connected to a large array of aluminum fins via multiple heatpipes. Since the fins are not directly attached to the base, additional support is provided by two stiff sections of wire that connect the fins to the base on the side opposite the heatpipes. Speaking of heatpipes, the SI-128SE only uses four as opposed to the SI-120's five, however the diameter has been increased to 8mm. The finned section has also grown, both in size and number of fins, and the only visual difference between the SI-128 and SI-128SE is the addition of thru-holes in the sides of the fins, a design copied over from the HR line of silent tower coolers."
from:
http://www.ocia.net/reviews/si128se/page2.shtml