2013 Mac Pro: Image Scaling with PhotoZoom Pro
A big thanks to Other World Computing for loaning the 8-core 3.3 GHz Mac Pro and authorized Apple dealer B&H Photo for loaning the 6-core 3.5 GHz Mac Pro.
PhotoZoom Pro 5 support GPUs via OpenCL explicitly and even has an optimization function for configuring for best performance.
My question to BenVista is whether both GPUs are utilized.