The air cooling vs. watercooling debate is not new. Ever since liquid AIOs entered the market, PC users have argued fervently for both sides. There was a time when air coolers couldn't hold a candle to the power and efficiency of liquid coolers. But, for over a decade now, we've seen high-performance air coolers go head-to-head with AIOs, with products like Noctua NH-D15 and Thermalrigt Peerless Assassin beating many 240mm and even some 360mm AIOs in performance.