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The Tests

AMD's Radeon HD 5000-Series: Measuring Power Efficiency
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Crysis serves as a base to compare measurements using graphics cards in their most popular workload—gaming. For this story, given the cards we were testing, we had to tone down the settings a bit. We chose the default CPU test under DirectX 9 (the High quality preset) at several resolutions (1024x768, 1280x720, 1680x1050, and 1920x1080). The CPU test was chosen instead of the default GPU test for two reasons. First, its POV is closer to the gaming experience, and second, the average frame rate from this test corresponds well to the performance you see throughout the single-player game. It is still sensitive enough to see differences between graphics cards and various settings/resolutions.

As our first test to compare to the Crysis baseline, we measured system power consumption when running Adobe Photoshop CS4 with GPU acceleration enabled via OpenGL. We ran through a series of zooming in and out using the Zoom tool, and then we zoomed in quickly on selected parts of the image using the Bird's Eye tool. Finally, we rotated the image using the Rotate View tool. Since we had to do this manually, there might be some concerns about accuracy and reproducibility of the workload from one system to the next. Thankfully, Adobe has done a very good job with Photoshop’s GPU acceleration. Power measurement results between runs indicate consistent measurements.

GPU acceleration settings in CS4GPU acceleration settings in CS4

We also ran Cinebench's R11 OpenGL viewport test. Here, we use peak system power consumption and compare it to the measurements taken in Photoshop. Since there's no way to accurately measure the performance of GPU accelerated-functions in Adobe’s software, we’re using the results from Cinebench as a measure of desktop application performance.

The third test is H.264-accelerated video playback in Cyberlink's PowerDVD 9.

We've also conducted some tests with Cyberlink's PowerDirector 8, making sure GPU acceleration is active for accelerated video filters (these filters will work with both AMD’s Stream and Nvidia’s CUDA APIs). PowerDirector also supports video encoding with GPU acceleration.

Cyberlink PowerDirector 8 build 3022Cyberlink PowerDirector 8 build 3022

Since PowerDirector 8 does not natively support hardware encoding on the GPU using AMD cards, we patched the application with the latest update (3022) and installed AMD’s Avivo transcoding tool. Disabling the hardware encoder and letting the processor handle encoding tasks changes the results significantly. The Radeon 2900 XT doesn't support hardware encoding and decoding, so only the filters will run on the GPU. Although the 790GX doesn't support hardware encoding, there is an option for hardware decoding, which we've left enabled.

 GPU acceleration settings in PowerDirector 8. GPU acceleration settings in PowerDirector 8.

For all of the Radeon HD 5000-series cards, we enabled hardware encoding, which is why you'll see such a large difference in performance.

As a side test, we've also included measurements taken with AMD’s Athlon II X2 250 with the graphics cards running GPU-accelerated filters and GPU encoding. This was done to gauge the value of using GPU-accelerated filters and encoding versus an all-CPU approach with the AMD Phenom II X4 955 BE. In addition to performance, we wanted to know how both setups differ in power consumption.

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