2013 Mac Pro: Importing with Aperture
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.
Apple Aperture might be expected to utilize the dual GPUs of the 2013 Mac Pro. It’s fast but it’s also unclear if it does so.