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Using Prime95 to stress the Core i7-5775C we see that it matched the Core i5-4690K while consuming 17% less than the Core i7-4790K.
This time when testing with Hybrid x265 the Core i7-5775C consumed 21% less power than the Core i7-4790K.
Again we see a 20% reduction in power consumption when comparing the Core i7-5775C to the i7-4790K.
The Core i7-5775C consumed 23% less power than the Core i7-4790K when measuring multi-threaded performance and just 10% less in the single thread test.