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More about 2019 Mac Pro vs iMac 5K vs iMac Pro...
2019 iMac 5K: Real World Photoshop: Make Multi-Res Image Series
Related: 2019 iMac 5K, 4K and 5K displays, computer display, iMac, iMac 5K, Macs, memory, Photoshop, video
MPG tested the 2019 iMac 5K 3.6 GHz Intel Core i9 8-core / 128GB / 2TB / Radeon Vega 48. Purchase with 8GB memory, then add 64GB or 128GB OWC memory. See recommended Macs for photographers and videographers.
These tests made possible by loaner gear from B&H Photo and OWC, so please buy your gear at B&H Photo and OWC/MacSales.com using any link from this site or MacPerformanceGuide.com, ditto for OWC/MacSales.com. See also 2019 iMac 5K: Recommended Models and Accessories.
Unsure which Mac to get or how to configure it? Consult with Lloyd.
This test is as real world as it gets, one that Lloyd does frequently for generating lens rendering aperture series, such as for this lens comparison. It is a time-consuming and work-stopping task, so performance gains are very welcome. It is a workflow that might have limited significance for the workflow of others. Still, if workflow is scripted in Photoshop, it likely applies.
The 5.8% difference is hardly noticeable, so the 2019 iMac 5K has no meaningful advantage.