The review editor over at Tom's Hardware got a nice surprise when an early sample of an Intel Core i7-7700K Kaby Lake processor landed unexpectedly on his desk. The opportunity was taken to give this chip a pretty thorough benchmark and comparison testing session against the chip it will replace, the Intel Core i7-6700K Skylake processor. It is noted that Intel declined to comment upon Tom's Hardware's findings. The Core i7-7700K sample isn't marked as an engineering sample, yet we can't be sure it is a retail sample either.
Intel is promising 300-400MHz higher clocks with its 14nm+ process, facilitated by transistor fin optimisation. The sample Intel Core i7-7700K Kaby Lake tested had base/boost frequencies of 4.2GHz/4.5GHz respectively. The predecessor i7-6700K offered a default base/boost of 4.0/4.2GHz. However the Kaby Lake chip is rated at 95W TDP compared to the 91W Skylake part. Below you will find power consumption and overclocking charts from Tom's Hardware tests.