Radeon HD 5750 & HD 5450 Graphics Cards

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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.

Estimated Power Consumption Comparison (DC)
Card
Idle
Load
ATI Radeon HD 5450 512MB
6W
7W
Asus EN9400GT Silent 512MB
11W
23W
PowerColor HD 4650 512MB
15W
28W
ATI HD 4770 512MB
28W
60W
Asus EAH5750 Formula 1GB
25W
77W
Asus EN9800GT Matrix 512MB
32W
80W
ATI HD 4830 512MB
18W
87W
Sparkle GeForce GTS 250 1GB
22W
87W
PowerColor HD 5850 1GB
21W
132W

The HD 5450 is easily the most energy efficient graphics card we've tested, using half the power of the GeForce 9400 GT when idle, and less then a third on load. Throwing this card on a motherboard equipped with its own integrated graphics won't draw much extra power.

The Asus EAH5750 Formula falls between the HD 4770 and 4830, using 25W idle and 77W on load, a reasonable amount for a midrange card.

Video Playback

Test Results: Video Playback
Test State
ATI Radeon HD 5450
Asus EAH5750 Formula
Avg.
CPU Usage
Avg. DC Power*
Avg.
CPU Usage
Avg. DC Power*
Rush Hour
(1080p H.264)
4%
+13W
6%
+7W
Coral Reef
(WMV-HD)
27%
+24W
28%
+55W
Spaceship
(1080p x264)
3%
+6W
3%
+27W
*compared to idle

Both the 5450 and 5750 passed our video test suite with ease, though the HD 5450 used considerably less power doing so. This was particularly notable during WMV-HD playback as we noticed that the 5750's clock speed was set to maximum rather than the UVD-prescribed 400/900MHz. It's a problem we encountered on the HD 5850 as well. The 5450, which uses almost as much power on load as when idle, was not as affected.



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