"It's been a very long time since Frostytech last tested an all-copper heatsink. Material expense and weight drive most manufacturers to aluminum fins, but not here. DeepCool's Killer Whale Premium heatsink is a carbon copy replica of the companies Killer Whale CPU cooler, just this time it's made entirely of copper. The large top-down heatsink has a jaw dropping weight of 1,225grams, or 1.225kg. That's a lot of weight to hang from a CPU socket, so it goes without saying that rear motherboard support brackets are mandatory! "