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Intel "Kaby Lake" 7700K CPU Review

By: Steven Bassiri | Intel CPUs in CPUs, Chipsets & SoCs | Posted: Jan 3, 2017 5:00 pm
TweakTown Rating: 91%Manufacturer: Intel

Page 11[Overclocking and Power Consumption]


CPU Overclocking




Overclocking is perhaps the strongest feature of the 7700K, and Intel has gone a bit further and added in some new settings for the 7700K. The first is the AVX Offset Ratio. Programs that use AVX such as IntelBurnTest spike power consumption and require more voltage to stay stable than non-AVX programs, so Intel has added in an AVX offset so that when an AVX program runs, the maximum overclock is reduced to avoid instability.



So while you game you can run at 5GHz, and when you want to run IntelBurnTest you can set a -200Mhz offset and the CPU frequency will drop to 4.8GHz for IntelBurnTest. The next thing Intel added is BCLK award adaptive voltage/frequency curve, and that should help simplify overclocking voltage levels.




The first thing I do is validate the CPU at the maximum frequency I can reach. In this case, I had to use Intel's Xtreme Tuning Utility to change the ratio in voltage after booting into Windows to 1.4v VCore (that's high for Kaby Lake). Since Sandy Bridge I haven't been able to easily validate 5.2GHz, Kaby Lake did it on the first try. Not only that, I could validate 5.3GHz on a really good chip if I had a program other than ITXU.




ASRock, ASUS, GIGABYTE (AORUS), and MSI all have reviews coming out soon. One of my new stability tests is for the system to attain 5GHz stable with a Corsair H110i AIO water cooling system and a 1.3v VCore. Every single motherboard I have tested so far has been able to attain 5GHz stability, which in this test means transcoding a 4GB 4K video to 1080p.


Did I mention in every case AVX Offset was not used, and the system ran 5GHz even when AVX was used? Results I have seen from MSI and ASUS's internal testing indicate that more than half of the CPUs they tested could run 5GHz stable with temperatures not peaking over 80C as long as a good cooler was used - that is excellent news.



Power Consumption




Out of the box, with the 4.5GHz turbo, the 7700K uses a decent amount of power. Sometimes we forget that voltage alone doesn't increase power consumption, current increases from frequency increases does as well.


When we equalize the 6700K and 7700K, their power consumption numbers are basically identical.

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