Intel Core i7-7820X CPU Review

Power Consumption & Overclocking

The Idle power draw of a system can vary quite a bit between system configurations depending on what is running, but our loaded draw of 222 Watts measured at the wall via a Kill-a-Watt meter shows a fairly mild power consumption, only a few watts above the 6700K and 7700K with half the cores. This is apparently a fairly efficient architecture compared to last generation that is also reflected with the 7900X and the 7740X.


Starting out at stock speeds, or the maximum default boost speed of our i7-7820X, we set out to see how far we can push the clock speeds.

Most serious overlocking enthusiasts do all of their overlocking from the BIOS, and that’s exactly where we head to push the I7-7820X to its breaking point. We adjusted the line load calibration to its stiffest setting to maintain CPU voltages under heavy overclocking loads, in this case ‘Level 1’ which rigidly maintains exactly the same voltage all the time. I started bumping up the multiplier and then the core voltage when it became unstable.

In the end, we managed 4.84Ghz fully stable across all cores. 103Mhz base clock into a 47X multiplier. This also kicked our 3200Mhz ram up to 3571Mhz.

Here are the CPUz screenshots. We ended up having to relax the memory timings just one notch for full stability, but that is the ram being pushed to the limits and not really any reflection of the CPU’s capabilities.

Running these speeds, Our Cinebench score jumped from 1738 to 2108. Not bad at all!

Disabling Cores

Shutting 2 cores down from the BIOS, we were able to push the remaining six cores to 4.94Ghz.

Dropping down to half of the active cores, we managed a hefty, 5.12GHz. Quite the increase from the stock 3.6Ghz. We dropped to 2 and even 1 core active, but were unable to get any significant increase in clock speed above this point.

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