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Lloyd recommends 64GB for iMac or Mac Pro for photography/videography.
iMac 5K (Late 2015) vs Mac Pro: Convert 50-Megapixel RAW Files to JPEG (Adobe Camera Raw)
Related: Macs, 4K and 5K, Mac Pro, workflow, software, iMac, digital sensor technology, Adobe Camera Raw, Mac
Save money on 32GB or 64GB OWC memory (about $400 savings vs Apple!)
The two machines tested here are the fastest possible CPUs as of late 2015. The iMac 5K as tested here is well into Mac Pro pricing territory, approaching $4K as configured, though of course it includes the display.
Raw file converson to JPEG
This test is a real-world task relevant to Adobe Photoshop or Adobe Photoshop Lightroom users: convert raw files to JPEG. Disk I/O is not a significant factor, accounting for only a few seconds of a 2+ minute job.
The 1.8% speed difference between 32GB and 64GB memory in the iMac 5K is within the margin of error. However, it was a repeatable finding with no obvious explanation.
The 8 CPU cores of the 3.3 GHz Mac Pro give it an advantage in this test; Photoshop ACR processes multiple raw files simultaneously.
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