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Intel "Skylake" Core i7-6700K CPU (Z170 Chipset and GT530) Review

By: Steven Bassiri | Intel CPUs in CPUs, Chipsets & SoCs | Posted: Aug 5, 2015 12:00 pm
TweakTown Rating: 94%Manufacturer: Intel

CPU Overclocking

 

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Overclocking is one of the strong points of the 6700K, Intel has put forth a lot more effort than they have in the past, and it seems to have paid off. If you are an overclocker, then there is some good news: Skylake overclocks really well.

 

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Intel made some major changes for overclocking on Z170. First of all the BCLK is now separated from the DMI and PCI-E, meaning no more BLCK ratios. BLCK can now be tuned like it was before Sandy Bridge existed, 100 to 200+ MHz in 1MHz increments. Haswell had a maximum CPU multiplier of 80X, Skylake has a CPU maximum of 83X. Skylake has memory tuned up to 41.33x compared to 26.67x on Haswell and Haswell-E.

 

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To overclock Skylake's CPU, you only really need to mess with the VCore which provides voltage to the cores and cache. A good CPU cooler like the NH-D15 or a Corsair H110i GT can handle 1.4-1.44v depending on the frequency, but I only needed 1.35v to get 4.8GHz under AIDA64 for an hour, and my temperatures didn't go above 80C, even though the room was pretty warm. The system agent and CPU IO voltages are also there, but they only need to be slightly increased for high speed memory overclocking, but for 3600MHz I didn't need to tinker with them on the Maximus VIII Hero. I didn't touch the cache ratio, but I will explore it in a future article.

 

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My really good Sandy Bridge CPUs could overclock and grab a maximum validation of 5.2GHz at 1.5v, Skylake can do the same. For reference, my good Ivy Bridge and Haswell CPUs had a very hard time doing this.

 

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I haven't really had time to do much stability testing, I will tune it more for future articles, but I do think that 4.8GHz stable is a real possibility with my sample and many others. This being a launch CPU indicates good things considering Intel usually increases yields as time goes on.

 

 

Memory Overclocking Results

 

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Both the Vengeance LPX and Ripjaws V worked well with the board, in fact both booted up by just setting XMP in the UEFI. It is really nice to see that the 36.00x multiplier is working. In future articles, I will cover overclocking in more depth.

 

 

Power Consumption

 

For measuring the CPU power consumption, I used an inline DC/DC Hall Effect monitoring IC to monitor the input on the 8-pin power connector, which should be isolated for CPU use only.

 

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The 6700K has a 95W TDP which is higher than its predecessors, but its idle power consumption is super low.

 

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What's interesting is that at 4GHz and with the same memory speed as the rest, the 6700K provides much better power consumption numbers, but 4GHz is actually a 200MHz under clock on the 6700K.

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