Examples for parallelism: ray tracer on the GPU
March 06, 2015
I tested the parallel ray tracer on all NVIDIA cards i bought. This page contains the results.
| Chip | Größe | Threadblock | FPS intern | FPS mit fraps |
|---|---|---|---|---|
| 285 | 640x480 | 16x16 | 254.1 | -- |
| 285 | 1920x1028 | 16x16 | 57.3 | -- |
| 580 | 640x480 | 16x16 | 519 | -- |
| 580 | 1920x1148 | 16x16 | 98 | -- |
| 680 | 640x480 | 16x16 | 690 | -- |
| 680 | 1920x1028 | 16x16 | 118.4 | -- |
| 780 OC | 640x480 | 16x8 | 795 | 650 |
| 780 OC | 1920x1080 | 16x8 | 155.8 | 150 |
| 780 OC | 2560x1440 | 16x8 | 89.6 | 85 |
| 780 OC | 3840x2160 | 16x8 | 26 | 25 |
| 970 | 640x480 | 16x8 | -- | 680 |
| 970 | 1920x1080 | 16x8 | -- | 150 |
| 970 | 2560x1440 | 16x8 | -- | 85 |
| 970 | 3840x2160 | 16x8 | -- | 40 |
Remark: I measured the fps with two different tools:
- With the example code from NVIDIA from the CUDA distribution.
- With the program fraps
The results were always different, because fraps measures the whole time from image to image and the NVIDIA timer only the CUDA part without the OpenGL parts. So the FPS value measured by fraps is less than the value measured by the NVIDIA timer.