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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.
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System Measurements:
VGA Test System (IGP)
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Measurement
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Idle
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CPUBurn
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CPU Temp
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33°C
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51°C
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SB Temp
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33°C
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41°C
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SPL@1m
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13 dBA
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System Power (AC)
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52W
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140W
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System Power (DC, est.)
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unknown
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111W
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Ambient temperature: 22°C
Ambient noise level: 11 dBA
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AMD Radeon HD 6570 512MB
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System Measurements: VGA Test System
(AMD Radeon HD 6570 512MB)
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Measurement
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Idle
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CPUBurn
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CPUBurn + FurMark
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CPU Temp
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28°C
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51°C
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54°C
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SB Temp
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34°C
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41°C
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43°C
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GPU Temp
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39°C
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43°C
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90°C
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SPL@1m
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14 dBA
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24 dBA
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System Power (AC)
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62W
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151W
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217W
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System Power (DC, est.)
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unknown
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121W
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177W
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Ambient temperature: 22°C
IGP system noise level: 13 dBA
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For reference, the HD 5570 reference cooler measured 17 dBA and 20 dBA on idle and at load respectively at one meter distance in our test system. Despite being similar in appearance, the HD 6570 heatsink was much quieter when idle at just 14 dBA@1m. On the flip side, the 6570 fan worked significantly harder on load, resulting in a noise level of 24 dBA@1m. The fan control seemed to be a little lax as well, allowing the GPU temperature to reach 90°C. The power difference between idle and load was about 55W.
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Our VGA test system with the HD 6570 installed measured 14 dBA when idle and 24 dBA on load at one meter's distance.
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When idle, the 6570 reference cooler was very quiet, without the tonality produced by many low-end stock fans. The addition of the 6570 added only a slight audible difference to our system, a subdued low pitched hum that blended into the background inconspicuously. On load, the fan noise was loud, whiny and turbulent.
AMD Radeon HD 6670 1GB
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System Measurements: VGA Test System
(AMD Radeon HD 6670 1GB)
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Measurement
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Idle
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CPUBurn
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CPUBurn + FurMark
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CPU Temp
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28°C
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52°C
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54°C
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SB Temp
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35°C
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42°C
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45°C
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GPU Temp
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32°C
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36°C
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76°C
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SPL@1m
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14~15 dBA
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20~21 dBA
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System Power (AC)
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62W
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152W
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206W
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System Power (DC, est.)
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unknown
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121W
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168W
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Ambient temperature: 22°C
IGP system noise level: 13 dBA
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Compared to the 6570, the 6670 stock cooler emitted about the same level of noise when idle but substantial less on load, about 3~4 dB. Furthermore, with both CPUBurn and FurMark running the 6670 actually consumed 11W less than the the 6570 (according to AMD, the 6670 should use 6W more). We're not sure why this is exactly, but we should note that AnandTech encountered something similar, a 5W advantage for the 6670 over the 6570. With a lower power draw and a substantially heftier cooler, the 6670's GPU core stabilized at a lukewarm 76°C on load.
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Our VGA test system with the HD 6670 installed measured 14~15 dBA when idle and 20~21 dBA on load at one meter's distance.
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At idle, the 6670 generated a comparable level of noise to the 6570, but the pitch of the sound was noticeably lower. On load, the noise level was much quieter, but the acoustics were again, lower in pitch but this time with a bit more tonality. The 6570 cooler had a more broadband profile.
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