We have fully loaded iMac Pros (18-core, 128GB RAM, 4TB SSD, VEGA 64 16GB GPU). But we are still choking on large VR footage and RED 8K footage (to use two examples). We are exploring adding external GPUs to help with this but we are having trouble finding concrete information about (1) which GPUs we should be looking at and (2) exactly what kind of performance benefits we could expect. Does anyone here have any solid leads on how we can further improve on the loaded iMac Pros we are already running? Many thanks in advance.