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iMac 5K (Late 2015) vs Mac Pro: Convert 50-Megapixel RAW Files to TIFF (Iridient Developer)
The two machines tested here are the fastest possible CPUs as of late 2015.
Canon 50-megapixel raw file converson to TIF
This test is a real-world task using Iridient Developer, which is efficiently multi-threaded.
While the 3.3 GHz 8-core Mac Pro wins here, the iMac takes only 17% longer in spite of having only 4 CPU cores and one GPU, which is a disappointing performance for this very high end Mac Pro (8 CPU cores and dual GPUs!).