ATI Radeon HD 4770: ATI's First 40nm GPU

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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
System Power
AC
DC (Est.)
Idle
73W
Unknown
CPUBurn
144W
115W
Ambient temperature: 21°C

 

ATI Radeon HD 4770 512MB:

VGA Test Bed: ATI Radeon HD 4770 512MB
System State
Fan Speed
SPL
@1m
GPU
Temp
Mem. Temp
Shader Temp
System Power
AC
DC (Est.)
Idle
1240
RPM
15 dBA
53°C
53°C
51°C
103W
79W
CPUBurn
55°C
55°C
53°C
177W
143W
CPUBurn + ATITool
1560
RPM
17 dBA
69°C
72°C
69°C
202W
165W
CPUBurn + FurMark
1720
RPM
17 dBA
73°C
74°C
72°C
214W
175W
Temperatures recorded via GPU-Z.
Ambient temperature: 21°C
Ambient noise level: 11 dBA
System noise level: 12 dBA

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.

System Noise Level Comparison
Card
Idle
Load
ATI HD 4670 512MB
13 dBA
16 dBA
ATI HD 4770 512MB
15 dBA
17 dBA
ATI HD 4830 512MB
14 dBA
21 dBA
ATI HD 4870 1GB
13 dBA
20 dBA
Ambient noise level: 11 dBA
System noise level: 12 dBA

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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