Asus EN9400GT Silent Edition

Graphics Cards
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TEST RESULTS

BASELINE, with Integrated Graphics: First, here are the results of our baseline results of the system with just its integrated graphics, without a discrete video card. We'll also need the power consumption reading during CPUBurn to estimate the actual power draw of discrete card later.

VGA Test Bed: Baseline Results
(no discrete graphics card installed)
System
State
CPU
Temp
System Power
AC
DC (Est.)
Idle
22°C
73W
Unknown
CPUBurn
39°C
144W
115W
Ambient temperature: 21°C
Ambient noise level: 11 dBA
System noise level: 12 dBA

Asus EN9400GT SILENT:

VGA Test Bed: Asus EN9400GT SILENT
System
State
Sys. Fan Speed
SPL
@1m
GPU
Temp
CPU
Temp
System Power
AC
DC (Est.)
Idle
7V
12 dBA
48°C
23°C
85W
64W
CPUBurn
49°C
41°C
157W
126W
CPUBurn + FurMark
69°C
42°C
171W
138W
CPUBurn + FurMark
9V
15 dBA
69°C
38°C
170W
137W
CPUBurn + FurMark
12V
18 dBA
65°C
33°C
170W
137W
Ambient temperature: 21°C.

The thermals of the EN9400GT Silent were very low during testing, staying below 70°C even when airflow was strictly limited. Increasing the speed of the only system fan to 9V did not improve the GPU temperature,and pumping it up to 12V resulted in only a 4°C difference. The card's fairly low power consumption and the heatsink's simple yet efficient design compliment each other well. It is an excellent combination for a silent PC.

Power

The power consumption of an add-on video card can be estimated by comparing the total system power draw with and without the card installed. Our results were derived thus:

1. Power consumption of the graphics card at idle - When CPUBurn is run on a system, the video card is not stressed at all, and stays in idle mode. This is true whether the video card is integrated or an add-on PCIe 16X device. Hence, when the power consumption of the base system under CPUBurn is subtracted from the power consumption of the same test with the graphics card installed, we obtain the increase in idle power of the add-on card over the integrated graphics chip (Intel GMA950). (The actual idle power of the add-on card cannot be derived, because the integrated graphics does draw some power — we'd guess no more than a watt or two.)

2. Power consumption of the graphics card under load - The power draw of the system is measured with the add-on video card, with CPUBurn and FurMark running simultaneously. Then the power of the baseline system (with integrated graphics) running just CPUBurn is subtracted. The difference is the load power of the add-on card. (If you want to nitpick, the 1~2W power of the integrated graphics at idle should be added to this number.) Any load on the CPU from FurMark should not skew the results, since the CPU was running at full load in both systems.

Both results are scaled by the efficiency of the power supply (tested here) to obtain a final estimate of the DC power consumption.

Power Consumption Comparison (DC)
Card
Est. Power (Idle)
Est. Power (Load)
Asus EN9400GT Silent
11W
23W
PowerColor SCS3
HD 4650
15W
28W
Asus EAH3650 Silent
18W
39W

Our EN9400GT Silent sample exhibited very low power consumption, beating out both the PowerColor HD 4650 and Asus HD 3650. Idle power consumption, we feel, is still not low enough. A modern integrated graphics chip uses about the same amount of power on full load as the EN9400GT when idle.



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