Tuesday, February 20, 2018

Intel Core i7-7820X 8-Core Processor Review

Overclocking on Skylake-X is not all that hard at all if you are familiar with Intel overclocking. First it is a good idea to set the BCLK to 100.00 MHz, so you do not have any fluctuations. The set your CPU clock ratio to what you are looking to hit. We are shooting for 4.8 GHz so we set our CPU clock ratio to 48.

Next you will need to adjust your voltage so your system will remain stable during full load. 1.25V CPU VCore seems to be where these high-core processor will remain stable with higher overclocks on all cores.

With these settings we were able to get a stable overclock of 4.8 GHz on all eight cores. Now temperatures did get up there, around 79C during stability testing, and that is with a NZXT Kraken X52. So you are going to want to keep that in mind.

So how does overclocking effect performance? Here are a few tests running the CPU at 4.8 GHz on all eight cores.

Bob Buskirk
the authorBob Buskirk
About 10 years of computer experience. Been messing around with electronics since I was 5, got into computers when I was in highschool, been modding them ever since then. Very interested in how things work and their design.
  • Tim Draper

    So you compare a $599 processor against a Ryzen 1700 without overclock and running Ram at 2133?

    Mmm, curious. I wonder what the justification for that could be?

  • Well one Tim we test processors against all other processors we have on hand, which included the Ryzen 7 1700 and other Intel parts in that price range as well. We do not have any AMD TR parts so we could not test those.

    As for the memory, that specific memory kit would not work on our Ryzen system at anything other than 2133 MHz. That is with the latest micro-code update and BIOS update for our motherboard. We troubleshooted the issue for a week but ran into the same result. We have yet to hear back from AMD on the issue.

    it is not a direct comparison, the other chips are there to give you an idea of performance across the board. I don’t think someone looking at a $599 chip would be considering a Ryzen 7 1700. We included the $999 i9-7900X in our testing as well and mentioned the ThreadRipper 1900X in the conclusion as an option around the same price.

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