A high-end model of the PowerPC chip that was planned for 1997, but never came to fruition. However, the 620 was the foundation for IBM's POWER3 line. See PowerPC and POWER.
"620." YourDictionary, n.d. Web. 18 August 2018. <http://www.yourdictionary.com/620>.
620. (n.d.). Retrieved August 18th, 2018, from http://www.yourdictionary.com/620