By having slower clock speeds, they don't get as hot and have a lower risk of heat-related damage. They're 'low power' because they use even less power than the 'T' models and have slower clock speeds than their full-size, non 'U' equivalents. The ' U' means the chip is designed for laptops and mobile devices, as 'U' chips are Intel's 'ultra-low power' models. The ' T' means the chips is designed to use less power while also having less performance than the standard chips without any letters. Surprisingly, the graphics processors in Intel's 'G' chips come from the company's main rival, AMD. But Intel's 'G' processors come with a more powerful graphics processor for more power-hungry apps and games. Most of Intel's chips come with basic built-in graphics processors so you can display something on your monitor without an entirely separate graphics card. The ' G' means the chip has a built-in graphics processor. Usually, it's mostly enthusiasts who tend to overclock their chips, and they're mostly designed for desktops or high-performance laptops. It also means the chip is 'unlocked,' where its clock speeds can be tweaked - or 'overclocked - by a user to squeeze out a little extra performance than what you get out of the box. The ' K' chips are usually the fastest, with higher clock speeds than the standard chips without a letter in Intel's mainstream chips. Those are the standard, base chip models. Some computers have Intel chips without any letters. Intel's chips have letters like 'K' and 'U' after the numbers that give you an idea of what kind of purpose and performance the computer is designed for.

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