https://docs.google.com/spreadsheets/d/1Xgm6hKO5iYZOK-mKZKrPN22SPtG8U5RzQJNNnjLErbE/edit?usp=sharing
https://www.reddit.com/r/Amd/comments/5tba1z/benchmarked_my_rx_480_every_10mhz_from_670_all/
Another guy posted this comment which also has some great data:
https://www.reddit.com/r/Amd/comments/5tba1z/benchmarked_my_rx_480_every_10mhz_from_670_all/ddluwrg/
https://www.reddit.com/r/Amd/comments/5sr1mg/guide_to_overclocking_the_nonreference_rx480_tons/
http://imgur.com/a/uo96A
https://www.reddit.com/r/Amd/comments/5tba1z/benchmarked_my_rx_480_every_10mhz_from_670_all/
Another guy posted this comment which also has some great data:
https://www.reddit.com/r/Amd/comments/5tba1z/benchmarked_my_rx_480_every_10mhz_from_670_all/ddluwrg/
https://www.reddit.com/r/Amd/comments/5sr1mg/guide_to_overclocking_the_nonreference_rx480_tons/
http://imgur.com/a/uo96A