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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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VGA Test Bed: Baseline Results
(no discrete graphics card installed)
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System
State
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System Power
|
|
AC
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DC (Est.)
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Idle
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73W
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Unknown
|
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CPUBurn
|
144W
|
115W
|
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Ambient temperature: 21°C
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ATI Radeon HD 4770 512MB:
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VGA Test Bed: ATI Radeon HD 4770 512MB
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System State
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Fan Speed
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SPL
@1m
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GPU
Temp
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Mem. Temp
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Shader Temp
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System Power
|
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AC
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DC (Est.)
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Idle
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1240
RPM
|
15 dBA
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53°C
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53°C
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51°C
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103W
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79W
|
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CPUBurn
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55°C
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55°C
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53°C
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177W
|
143W
|
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CPUBurn + ATITool
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1560
RPM
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17 dBA
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69°C
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72°C
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69°C
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202W
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165W
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CPUBurn + FurMark
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1720
RPM
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17 dBA
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73°C
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74°C
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72°C
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214W
|
175W
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Temperatures recorded via GPU-Z.
Ambient temperature: 21°C
Ambient noise level: 11 dBA
System noise level: 12 dBA
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During testing, temperatures stayed well within reasonable levels — at
full load, the GPU core temperature measured only 73°C. The relatively low
temperatures are due to decreased power with the 40nm die and the card's dual slot cooler, which
is a bit of overkill for a card rated for 80W TDP. It could probably cool
the GPU adequately with 1000 RPM or less.
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System Noise Level Comparison
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Card
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Idle
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Load
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ATI HD 4670 512MB
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13 dBA
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16 dBA
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ATI HD 4770 512MB
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15 dBA
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17 dBA
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ATI HD 4830 512MB
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14 dBA
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21 dBA
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ATI HD 4870 1GB
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13 dBA
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20 dBA
|
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Ambient noise level: 11 dBA
System noise level: 12 dBA
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With the 4770's fan idling at 1240 RPM, the system noise level measured 15 dBA,
slightly higher than most of ATI's recent offerings. The noise
was fairly unobtrusive with the motor's grind being muffled by our case's
side panel to the point where only a low-pitched hum was audible. The fan speed
began to increase once the GPU heated up to about 65°C, finally settling
at 1720 RPM at full load. The noise level at this point was only 17 dBA —
a significant improvement over the HD
4830. It can be easily masked by the music and sound effects from your
average PC game. We are also happy to report our HD 4770 did not have even a hint
of coil whine or cause such whine in our test system's power supply or motherboard.
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