Same thing on mine. They did a really good job applying the thermal paste and its not some junk brand either its the premium stuff.
As far as the aluminum. The ES one I had seen was made from delrin not metal. The chipset cooler itself is all copper just the top isnt so theres really no grounds there. LOL if you wannaabout something not being copper go check out some Asus heatsinks painted to look like copper.
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