You would expect a new generation of Intel CPUs to be noticeably faster than the one which came before, but the performance delta between the latest, 8th Gen “Kaby Lake Refresh” chips and their 7th Gen “Kaby Lake” predecessors feels like a two or three year leap.

By doubling the number of cores from two to four, increasing the maximum clock speed and optimizing around video, Kaby Lake Refresh is as much as 91 percent quicker, depending on what task you perform.

How We Tested

To properly compare Intel 8th Gen Core to 7th Gen Core, we tested four laptops. Intel provided us with a pair of 14-inch Acer Swift 3 notebooks, each with a 1080p screen, 8GB of RAM and the same exact 256GB SSD, but one of the Swift 3 units had a new Core i5-8250U CPU while the other was powered by a 7th Gen, Core i5-7200U chip.
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https://www.laptopmag.com/articles/kaby-lake-refresh-8th-gen-vs-7th-gen