Asus P7H55D-M EVO LGA1156 microATX Motherboard

CPUs|Motherboards
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Power Consumption

Motherboard power consumption varies even between models using the same chipset due to differences in power regulation, quality of components, and extra hardware like third party controllers. As sucht, we measure power draw from both the wall and from the AUX12V connector with the help of a pair of digital multimeters and an in-line 0.1 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. This can help us narrow down the causes of power consumption differences between two similar boards.

DC Power Consumption: Idle/Load
Test State
Asus P7H55D-M EVO
Intel DH55TC
System
CPU + VRM
Diff.
System
CPU + VRM
Diff.
Idle
31W
9.9W
21.1W
18W
5.3W
12.7W
CPU Load
73W
47.2W
25.8W
60W
46.0W
14.0W
CPU + GPU
Load
78W
50.1W
27.9W
67W
51.2W
15.8W
CPU Load (Turbo)
76W
49.0W
27.0W
63W
48.0W
15.0W
CPU Load + GPU Load (Turbo)
80W
51.7W
28.3W
69W
52.7W
16.3W
CPU + VRM power measured from the AUX12V connector (combined DC draw of VRMs and CPU).

When we initially reviewed the Clarkdale platform, we were blown away by the low power consumption attained when pairing the Core i5-661 and Intel DH55TC. The same processor on the P7H55D-M EVO is not nearly as efficient. Strangely, the power measurements of the CPU and VRMs showed a 5W difference when idle that evaporated when the system was placed on load. But whether idle or on load, the system consistently used 11~13W more. This is a puzzling result that we can't explain.

DC Power Consumption: Video Playback
Test State
Asus P7H55D-M EVO
Intel DH55TC
Rush Hour
(H.264)
37W
31W
Coral Reef
(WMV-HD)
38W
31W
Disturbia
(Blu-ray H.264)
51W
43W
Becoming Jane
(Blu-ray VC-1)
46W
39W
Space
(x264/MKV)
43W
not tested
TurboBoost disabled during video playback testing.

The power discrepancy continued during video playback tests. As the exact same hardware was used with both motherboards, it appears that something on the P7H55D-M EVO is constantly using extra power regardless of what the system is doing.

As the graphics core is integrated on the processor itself and not the motherboard, we omitted CPU usage figures as they were the same. Please refer to our Core i5-661 review for more detailed test results regarding Intel's GMA HD graphics.



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