When one mentions an AMD Threadripper CPU and efficiency in the same sentence, it can draw some raised eyebrows. How on earth can a 64-core beast like the Threadripper 9980X be anywhere near efficient with a TDP alone of 350W? You can expect this CPU to draw up to 400 watts of power through the socket at stock settings, but after using it in place of a few used enterprise rack servers, I’ve discovered it to be incredibly efficient, even compared to a few mini PCs.