Video Playback Performance
We used Windows Media Player 10 with the DirectX Video Acceleration for WMV HD content patch installed to compare the performance of the graphics cards at playing video in various formats. Here are our test clips:
- Magic of Flight (WMV HD, 1080p)
- A DivX clip in 640x480
- A Blue Streak DVD (PAL)
Here are the data about the CPU load during playback:
The CPU load is really smaller with the GeForce 7800 GTX than with the GeForce 6800 Ultra, but the RADEON X850 XT Platinum Edition can boast the same results. The latter must be profiting a lot from its high core frequency – a CPU load of 47% during 1080p playback is very, very good.
The RADEON X850 XT Platinum Edition takes the first place in the DivX playback test. The peak CPU load is only 10% with this graphics card, while NVIDIA’s solutions have a maximum load of 16%.
The GeForce 7800 GTX and the RADEON X850 XT Platinum Edition are both successful with the DVD disc, while the GeForce 6800 Ultra puts a considerably higher load on the CPU.
According to the results of the tests, the GeForce 7800 GTX unloads the CPU during video playback better than its predecessor. At the same time, the results of the new product are analogous to those of the RADEON X850 XT Platinum Edition, so there is no breakthrough in this area. Anyway, the GeForce 7800 GTX ensures a higher playback quality of DVD and other interlaced content thanks to the adaptive de-interlace algorithms. Unfortunately, we can’t publish some screenshots to illustrate our point, but we’re going to do so in our upcoming articles soon.