The Performance & Power Efficiency Of The Core i7 990X vs. Core i9 9900K
Written by Michael Larabel in Processors on 21 October 2018. Page 5 of 5. 17 Comments

The Blender 3D modeling software also obviously benefits a great deal from the newer Intel microarchitectures.

Scripting languages like Python and PHP also saw big performance gains in their single-threaded tests.

Those wishing through even more test data can find all the raw numbers at, our cloud component to the Phoronix Test Suite automated benchmarking framework.

Obviously over the course of all the benchmarking runs when using an Arctic Freezer 12, the Core i9 9900K with its 95 Watt TDP rating ended up running much cooler than the 130 Watt Core i7 990X.

The overall AC system power consumption over the course of all the benchmarks carried out provides a nice overall look.

The 990X was idling at around 98 Watts compared to 52 Watts for the new Coffeelake refresh system. The average load power draw was 172 Watts that dropped down to 120 Watts with the 9900K while the peak power consumption was also a big difference at 225 Watts versus 164 Watts. Keep in mind as well that the coming soon Core i9 9900X is a more comparable test target to the Core i7 990X given the more similar launch prices and being part of the EE/X-Series line-up. The 9900K by comparison has a launch price about half that of what the 990X was shipping for back in 2011. Once the i9-9900X is out, I'll gladly repeat this comparison against the i7-990X. Anyhow, for those curious about the 990X vs. 9900K with how the Intel performance and power efficiency has improved from Westmere to Coffeelake, hopefully you found this data interesting one way or another.

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Michael Larabel is the principal author of and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and automated benchmarking software. He can be followed via Twitter or contacted via

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