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The Xigmatek Achilles S1284C performs right about where I expected it to in the trio of testing I have recently done for Xigmatek. While falling behind the Thor's Hammer by about 2° at idle and 3° at load from the two fan results previously posted, for this solution which only offers a single fan cooling configuration, I think it shows an admirable performance.
While the Achilles isn't going to set any records with the low amount of noise that emanates from this cooler at full speed, 53dB is nothing to scoff at. I feel Xigmatek did a nice job of mating flash and function with the Achilles overall.