Asus P5Q-EM G45 mATX motherboard

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TEST RESULTS

Our test system is fairly basic, featuring a Core 2 Duo E7200 (45nm, 65W) cooled by an Arctic Cooling Alpine 7 Pro connected to a variable DC fan controller so the fan's power draw does not come into play, and a single stick of Corsair memory. The rest of our test test platform consists of an Asus Blu-ray drive, a 5400RPM notebook hard drive, and an OEM Seasonic 400W power supply. The operating system used is Vista Home Premium SP1 (32-bit).


P5Q-EM with CPU, memory and heatsink installed.

We tested the board with the CPU at stock settings with SpeedStep enabled and underclocked/undervolted to the minimum stable settings the BIOS would allow: 1.2Ghz at 0.850V.

Test Results: Asus P5Q-EM
Test State
E7200 @ 2.53Ghz (EIST)
E7200 @ 1.2Ghz (0.850V)
Mean
CPU Use
Peak
CPU Use
System Power
Mean
CPU Use
Peak
CPU Use
System Power
Off
N/A
2W
N/A
2W
Sleep (S3)
N/A
3W
N/A
3W
Idle
N/A
44W
N/A
41W
Rush Hour
37%
55%
~53W
59%
93%
~47W
Coral Reef
28%
39%
~51W
38%
53%
~46W
Flight Sim.
36%
49%
~54W
67%
80%
~48W
Drag Race
50%
63%
~55W
73%
88%
~48W
Prime95
N/A
74W
N/A
51W
Prime95 + ATITool
N/A
76W
N/A
55W

At stock settings, the system idled at 44W, drew in the mid 50s during video playback, and about 75W on load. Stressing the IGP did not significantly increase power consumption. The X4500 graphics chip did not have any problems with our test suite, passing it with flying colors. The CPU usage was relatively low during video playback but the processor was running at its full clock speed most of the time according to CPU-Z.

At 1.2Ghz and 0.850V, power consumption was 3W less at idle, about 6W during video playback and approximately 22W lower on full load. Despite the extremely low clock speed (none of Intel's desktop dual core processors are less than 1.6Ghz), our entire video test suite played smoothly without any problems.

System Power Consumption Comparison
Test State
Intel DG45FC
(G45 mITX)
Asus P5Q-EM
(G45 mATX)
Asus P5E-VM
(G35 mATX)
Off
2W
2W
3W
Sleep
7W
3W
4W
Idle
35W
44W
47W
Rush Hour
~42W
~53W
~52W
Coral Reef
~43W
~51W
~52W
Flight Sim.
~46W
~54W
~55W
Drag Race
~47W
~55W
~56W
Prime95
64W
74W
73W
Prime95 + ATITool
65W
76W
75W

The power consumption of the board was somewhat disappointing after our experience with the Intel DG45FC, Intel's mini-ITX G45 motherboard. The DG45FC was extremely power efficient, with an especially impressive idle power reading. The P5Q-EM idled almost 10W higher. Compared to Asus' G35 motherboard, the P5E-VM HDMI, it was only 3W lower at idle, and during video playback and full load, the power draw was nearly identical.

The P5Q-EM and DG45FC use the same chipset, but the P5Q-EM has a few more devices to power, including a PCI-E 16x slot, two PCI slots, and a FireWire controller. It should also be noted that the DG45FC may have less versatile power regulation circuitry as it does not support Intel's quad core CPUs. Manufacturers tend to make boards with more power phases for high wattage processors, sometimes resulting in lower efficiency when the power draw is low.



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