Intel Core i5-9400 Review

Written by Antony Leather

May 1, 2019 | 07:00

Tags: #9th-gen-core #coffee-lake #coffee-lake-refresh #core-i5 #core-i5-9400 #z390

Companies: #intel

Power Consumption

For all of the overclocked performance tests, we disable all power-saving technology in order to give us a consistent set of results and also best-case performance numbers - even though technologies such as Intel's SpeedStep might only take microseconds to kick in, that can make a difference in some tests.

However, for the stock speed results and power consumption tests, we re-enable everything in order to get a more real-world power draw. The power draw is measured via a power meter at the wall, so the numbers below are of total system power draw from the mains, not the power consumption of a CPU itself.

We use Prime95's small FFTs test to put the CPU under 100 percent load, while idle power results are taken with the PC sitting at the WIndows desktop.

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