From iPi Docs
Multiple GPUs in iPi Mocap Studio
You can use multiple GPUs to speed up tracking with the following limitations:
- You can use only 1, 2 or 4 GPUs inside one PC. Other configurations (for example, 3 GPUs) are not supported.
- Dual-GPU video cards like NVIDIA GTX 690 work in iPi Mocap Studio in the same way as 2 separate GPUs. The same instructions are applicable to such cards.
- For best efficiency, all GPUs must be of approximately the same performance. iPi Mocap Studio cannot balance load for multiple GPUs with different performance levels, so mixing low-end and high-end GPUs will result in very poor performance.
- Due to synchronization overhead, performance scaling is not linear. Performance gain diminishes with the number of GPUs. Using second identical GPU will speed up tracking approximately by a factor of 1.6 (instead of factor of 2, as one might expect).
- Performance gain is more noticeable for large number of cameras (6+). If you are using just 1 Kinect camera (or other single depth sensor), you may even experience performance downgrade compared to a single GPU.
- Combining multiple low-end GPUs makes little sense. You may achieve much better performance by upgrading to a single high-end gaming GPU like NVidia GTX 970 and above.
How to Configure Multiple GPUs
To configure your multiple video cards for use in iPi Mocap Studio, you should perform the following steps:
- Disable SLI or Crossfire
- Restart iPi Mocap Studio. Now it should be able to use your additional GPUs.