Intel Devil's Canyon Core i7-4790K Review

👤by David Mitchelson Comments 📅10-06-14
Benchmarks: Power Consumption

Energy consumption between different CPU models started to be a key point of interest in the Sandy Bridge era due to enormous gains in the perf/Watt metrics which were normally the province of GPUs along. We analyse two crucial figures: first of all idle tests where the system is cold booted into Windows and no additional applications are executed - the watts are noted on the external energy monitor we use; second the system is loaded with 3DMark FireStrike - watts are again monitored for the duration of the test and the highest rated wattage result is then noted down. Below are the results of this energy test.


Intel Haswell CPUs will down-clock to 800MHz when idle, resulting in a far lower idle power figure than the Ivy Bridge and Sandy Bridge which could only reach as far as 1600MHz. In the case of the i7-4790K it achieved a lower idle power consumption than the 4770K on the same motherboard, despite an ostensibly higher TDP. As expected when under load at stock speeds the power consumption was higher than its older counterpart due to the higher base and boost clocks (and higher voltages required), although 11W (~4%) is not signficant.

Another noteworthy result from these tests is the impact of the motherboard on idle power consumption - changing motherboard can have a more significant effect than changing from 4770K to 4790K.





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