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Intel Core i7-7820X X-Series Skylake-X 8C/16T CPU Review (Page 7)

By Steven Bassiri from Aug 8, 2017 @ 17:04 CDT
TweakTown Rating: 91%Manufacturer: Intel

CPU Overclocking

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I found that my 7820X could overclock to 4.7Ghz with 1.225v VCore and 1.75V input voltage. Our stability test here does engage AVX, which greatly increases power consumption and temperatures, but I didn't need to use an AVX offset, so I was able to transcode a 4K video to 1080P with ease. I broke 80C on some cores, but I also had a fan blowing at the VRM so that the VRM didn't have a chance to overheat.

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To overclock the CPU I set CPU ratio to 47, set CPU Ratio mode to fixed (so frequency won't drop at idle), enabled XMP for memory, dialed in 1.75v VIN and 1.225v VCore, and lastly, I set LLC to Mode 2 under MSI's DigitALL Power menu. I would say overclocking this CPU is easy, but you are going to hit a thermal wall because of the thermal paste, so if you have better cooling or a de-lidded CPU, you will do wonders.

Power Consumption

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I went back and re-tested the 7900X's CPU power consumption and increased the polling rate for my measurement instruments and I found that it uses a ton of power. Of course, the power consumption numbers under load are taken at the 8-pin and while the CPU is under a full AVX stress test load (worst case).

I will say that I wasn't surprised to find that the new BIOS ushered in slightly lower power consumption, but rumors have it that a new beta microcode will reduce those numbers even further.

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