Intel's first consumer processor to be sold with a clock speed of 4 GHz or higher was the Core i7-4790K, launched in 2014 as part of the Haswell Refresh, also known as the "Devil's Canyon" series.

Desktop: Intel Core i7-4790K (Haswell Refresh) Intel's Intel Core i7-4790K (aka Devil's Canyon) quad-core processor with hyperthreading, delivers more than just a jump in clock speed. With this ...