GPU mining was in use by mid-2010, with public GPU mining software appearing later that year.

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Location PART 2 - FOUR HIDDEN CHIMNEYS CHAPTER 8: THE SHIELD OF SCREWTAPE Back With Satoshi

"GPU mining was in use by mid-2010, with public GPU mining software appearing later that year."

Bitcoin's historical timeline records early GPU mining in July 2010 and public CUDA and OpenCL mining software in September and October 2010. + Bitcoin Wiki timeline page is explicitly titled 2010.

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Source title 2010

Source authors Bitcoin Wiki contributors

Source year 2010

Confidence high

Importance mid