iMac 5K vs Mac Pro: Iridient Developer: Convert 50-Megapixel Images to 16-bit TIF
This test is a real-world task using Iridient Developer, which is efficiently multi-threaded.
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iMac 5K vs Mac Pro: Convert 50-Megapixel RAW Files to TIFF (Iridient Developer)
See diglloyd enhancement kits for late 2015 iMac 5K as well as iMac 5K: Building a High-Performance Configuration.