Apple 27-inch iMac with Retina 5K display: 3.8GHz 8-core 10th-generation Intel Core i7 | Sweetwater
New iMac rumored to get XDR redesign, ARM CPU and ship in 2020 - CNET
Upgrade iMac Intel Core i3 CPU to Core i7 - iFixit Repair Guide
Apple iMac 27-inch (Intel Core i5-4670) - Review 2013 - PCMag UK
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Refurbished 27-inch iMac Pro 3.2GHz 8-core Intel Xeon W with Retina 5K display - Apple
CPU Core2Duo 3.06 GHz E7600 SLGTD iMac 27 inch A1312 Late 2009 Original - used original spareparts for Macs