Sapphire HD 7750 Ultimate 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 its integrated graphics, without a discrete video card. We also need the power consumption reading during CPUBurn to estimate the actual power draw of the discrete card later.

System Measurements:
VGA Test System (IGP)
Measurement
Idle
CPU Load
CPU Temp
33°C
51°C
SB Temp
33°C
41°C
SPL@1m
13 dBA
System Power (AC)
52W
140W
System Power (DC, est.)
unknown
111W
Ambient temperature: 22°C
Ambient noise level: 11 dBA

System with Sapphire HD 7750 Ultimate:

As the Sapphire HD 7750 Ultimate is passively cooled, the measured noise level below was generated by the rest of our test system components. It is a very quiet machine with just one Nexus and two Scythe Slip Stream fans. Like many modern video cards, the HD 7750 Ultimate produced some coil whine on load, but it was too soft to be picked up by our mic and inaudible from a one meter distance.

System Measurements: VGA Test System
(Sapphire HD 7750 Ultimate)
State
Idle
CPU Load
CPU + GPU Load
System Fan Speed (SPL@1m)
7V (12~13 dBA)
9V
(16 dBA)
12V
(20~21 dBA)
CPU Temp
29°C
51°C
53°C
49°C
47°C
SB Temp
36°C
41°C
44°C
42°C
40°C
GPU Temp
36°C
39°C
67°C
63°C
60°C
System Power (AC)
60W
149W
188W
186W
186W
System Power
(DC, est.)
unknown
119W
153W
151W
151W
Ambient temperature: 22°C

The HD 7750 Ultimate GPU stayed well under 70°C on load even with only a single case fan undervolted to 7V, a level that made the system almost inaudible. This is impressive, considering FurMark is a highly demanding synthetic torture test that exceeds the stress level of modern games, and our test system is about as airflow-starved as you can get. Increasing the system fan speed resulted in marginal thermal improvements. We also saw only a 2°C increase in CPU temperature while stressing the GPU, so there wasn't much heat wafting upwards from the video card. The power consumption levels were also quite stingy. The system pulled 39W more when stressing the GPU, compared to the CPU on load alone.

POWER CONSUMPTION

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 idle. 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.

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. 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.

Note: The actual power of the add-on card cannot be derived using this method because the integrated graphics may draw some power even when not in use. We estimate that the integrated HD 4200 graphics chip in our test configuration uses 3~4W. However, the relative difference between the cards should be accurate.

With an estimated idle power of 8W, the HD 7750 Ultimate used a third of that of the Asus EAH5750 Formula. On load, it consumed about half of the HD 5750's 77W. This a substantial improvement if the two cards are indeed comparable in performance.



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