Been testing the red car test now I have it and found the following. All testing done using VP 16 Build 424
Changing the dynamic ram preview max affects rendering speeds quite a lot. As you increase the preview ram the amount of ram used during renders (not previews) goes up AS WELL as the GPU Ram used. So if I set my dynamic ram preview ram to 5GB, it will use 5GB of system RAM and GPU RAM during the render. But the best bit is how it affects render speeds as more isnt necessarily good. My specs in my sig but I have 32GB RAM and 6GB GPU RAM.
The following are the times to render the red car test using MAGIX AVC - 30fps 1080p NVENC
RAM 0mb - 38 seconds
RAM 50-2000mb - 20 seconds
RAM 2500mb+ - 28 seconds
I know a lot of people set the ram to zero to improve stability (no problems here with VP16) but this seems to increase final render times by 20% and using more RAM over 2.5GB also has the same, negative effect.
For me I use a sweet spot of 1024mb. I can build a dynamic ram preview of most clips if needed and I also maintain my max render speed.
While I was in there I also tested max number of render threads and no matter what I set it to the speed remained the same.