The Predator 21X’s size lets it hold very high overclocks without sounding like an F-22 on afterburners. Unplugging the laptop would switch off the overclock and severely ratchet back the GPU clock speeds. When there wasn’t a load on the Predator 21 X, the laptop would behave in a more civil matter. But considering the Predator 21 X’s formidable power load, it’s probably safest to hit full stop rather than shove a 400-watt load onto the onboard batteries in a millisecond. For any other laptop, you’d expect it to switch over to the internal battery. We ran into one interesting behavior: If you push the GPUs hard running Furmark, with the CPU and GPUs overclocked, and then suddenly pull the plug, the Predator 21 X immediately cut power to the laptop. Power consumption itself, for what it’s worth, generally sat in the 400-watt range under a graphically intense workload such as Furmark. For the sake of appearance and neatness, it’s a nice touch you’d expect of a premium machine. In a sign of how much thought Acer put into the Predator 21 X, the company includes a rubber stand for the AC adapters, emblazoned with the Predator logo and shaped in an X. The Predator 21X runs on two 330 watt bricks that can stylishly be held together using the included X-shaped rubber coupler. Both are identical, so there’s no specific order for plugging them in. Because no external bricks are available in sizes larger than 330 watts, Acer uses the old trick of slaving two 330-watt bricks together. As you can imagine, all of this hardware takes a considerable amount of power to run.
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