Thanks to another thread for asking about GPU+CPU combo render, it forced me to do some testing if I can repeat the issue where our memeber didn’t see the performance improvements when mixing CPU+GPU.
Seems there is a GPU Tile Performance drop.
Expected that GPU tile settings no longer make a difference in performance, but it seems there is a regression at least for OpenCL in 2.8?
Can anyone else test and post their results of just GPU tests for various Tile settings?
So if you can BMW 2.0 (two car version), post version of OS\Blender\Render path (openCL\CUDA)
UPDATE Definitely an Issue with OpenCL.
Either Blender 2.8 or AMD drivers … still investigating
Screenshot below shows Single then Dual GPU usage. High usage is with Single GPU, lower usage with two GPU’s. Device usage drops by nearly 1/2 for each device… Also confirmed via GPU-Z…
Still current testing:
Windows 10 \ Blender 2.8 \ OpenCL
|2x Vega 56||x||1.17.0||1.19.6||1.39.3||2.19.7|
|CPU - TR 1950x||x||x||2.15.9||2.04.4||2.00.5|
|CPU + 1 GPUs||x||x||1.27.7||1.15.6||1.29.3|
|CPU + 2 GPUs||x||x||1.19.5||1.07.6||1.10.6|