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Note: by default the board's UEFI BIOS set Turbo Boost to push the multiplier to 39x for a clock speed of 3.9 GHz regardless of how many cores were in use, producing very high power consumption numbers. To make things fair, we dialed it back with similar settings we've used previously with the i7-4770K (39x/38x/37x/36x for 1/2/3/4 core operation).
Of all the Haswell boards we've used thus far, the Z87X-UD5 TH exhibited the highest light load power consumption. At idle, the difference was between 5W and 8W, and a bit less during H.264 and Flash video playback. Advanced voltage regulation can sometimes give up some efficiency
at lower levels but the board is also equipped with a vast feature-set that might also be partially responsible. On heavier loads, the results were middling, using about the same amount of power as the Intel DZ87KL-75K in real-life situations.
Unfortunately it's difficult to ascertain exactly how much of the energy draw
is generated by the processor alone, as the amount of power pulled from the
AUX12V/EPS12V connector depends on how board power regulation has been implemented. The GA-Z87X-UD5 TH doesn't rely as heavily on the +12V line as the pair of mini-ITX boards compared, the Z87N-WIFI and ASUS Maximus VI Impact, which use a relatively simple power phase design.
To test the board's cooling, the CPU was stressed for ~15 minutes with Prime95. Temperatures of the boards' chipset heatsinks were recorded using a spot thermometer. The highest temperatures were taken for comparison.
Cooling is one area the Z87X-UD5 TH excels, posting a record for combined PCH and VRM temperature. At their hottest points, the heatsinks were barely lukewarm, peaking at around 20°C above ambient on full CPU load.
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