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AMD Processor Use in Linux Gaming Surpasses 70% Market Share
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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I think you are half right. For the most part it's price effectiveness in the spec range, but there are other considerations such as battery draw with laptops, or iGPU if you're not running or looking for a video card. For the same price, looking into the performance or efficiency related to the type of programs you are using is still worthwhile.