Zotac H55-ITX-C-E: Stacked LGA1156 Mini-ITX Motherboard

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Detailed DC Power Consumption

During testing we record power consumption both from the wall and from the AUX12V connector with the help of a pair of digital multimeters and an in-line 0.01 ohm shunt resistor. The latter measures how much energy is being drawn on the +12V line by the processor including inefficiencies lost to the VRMs. In some cases, this can help us narrow down the causes of power consumption differences between boards.

Note: Testing was conducted with the WiFi adapter enabled, but not connected. When logged into our network, the power consumption increased by 2W. At the other end of the spectrum, removing the adapter altogether lowered the total draw by 1W.

DC Power Consumption: Idle/Load
Test State
Idle / Load Voltage*
Idle
CPU Load
CPU + GPU Load
Intel DH55TC
System
unknown
18W
63W
69W
CPU + VRM
5.3W
48.0W
52.7W
Asus P7H55D-M EVO
System
0.968V / 1.144V
31W
76W
80W
CPU + VRM
9.9W
49.0W
51.7W
Zotac H55-ITX-C-E
(-0.100V)
System
0.952V / 1.216V
32W
79W
105W
CPU + VRM
10.8W
40.7W
57.4W
Zotac H55-ITX-C-E (stock)
System
1.056V / 1.320V
33W
91W
117W
CPU + VRM
11.7W
47.4W
64.3W
Combined CPU + VRM DC power draw measured from the AUX12V connector
* according to CPU-Z

Compared to the Asus P7H55D-M EVO, the Zotac H55-ITX used about the same amount of power when idle, but significantly more on load. This is easily explained as by default, the board assigned our i5-661 processor a rather high core voltage, 1.320V on load, 0.176V more than the P7H55D-M. Using the maximum -0.100V undervolt in the BIOS, the CPU load power was reduced to a more manageable 79W, but this was still 3W more than the Asus board.

The power draw of the board while stressing the integrated graphics was a much greater mystery. With both Prime95 and FurMark running, our undervolted H55-ITX setup consumed 25W DC more than the P7H55D. The increase compared to stressing the CPU alone was about 5W for the other two H55 motherboards we've tested, so how this board managed to use 5 times as much was baffling. Even if the integrated graphics core was overclocked and overvolted, it should not be that power hungry.

Needless to say, the Intel DH55TC, the first LGA1156 board we've tested, easily holds onto its energy efficiency crown — nothing comes close.

Video Playback Power Consumption

DC Power Consumption: Video Playback
Test State
Zotac H55-ITX-C-E
Asus P7H55D-M EVO
Intel DH55TC
Rush Hour
(H.264)
40W
37W
31W
Coral Reef
(WMV-HD)
38W
38W
31W
Disturbia
(Blu-ray H.264)
48W
51W
43W
Becoming Jane
(Blu-ray VC-1)
48W
46W
39W
Space
(x264/MKV)
43W
43W
not tested

During video playback, the H55-ITX on average used slightly more power than the P7H55D-M overall, however as the presence of the WiFi adapter boasts the board's power consumption by 1W, it's really a wash. Video playback energy efficiency was virtually identical when the H55-ITX was undervolted, so the results were omitted.



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