Tom's Hardware had the opportunity to test a leaked retail sample of Intel's Core i7-7700K "Kaby Lake" processor, you can check their findings over here. The official launch is still more than a month away but the initial benchmark results don't look that encouraging, the chip overclocks well but seems to have lower energy efficiency than Skylake.
Intel’s Kaby Lake efficiency pretenses are thrown out the window in the Core i7-7700K, at least when paired with this motherboard. Perhaps we have something to look forward to when Z270 finally gets here?
For true performance enthusiasts, the real news is that Intel’s new mainstream-socket enthusiast CPU will reach new overclocking heights. Unfortunately, getting its extra heat out of the core was quite a challenge, as even stepping up from Noctua’s NH-U12S to its NH-D14 saved a mere 3°C. This overclocking experiment even required a 15°C room temperature, which is something most readers won’t be able to accomplish.