You have choices of four of the latest 10th-generation Intel Core processors: a 3.1 GHz 6-core i5, a 3.3 GHz 6-core i5, a 3.8 GHz 8-core i7, and a 3.6 GHz 10-core i9. Performance and cost both rise through that list.
Higher Performance Graphics
Apple also moved to the next-generation AMD Radeon Pro graphics chips, with the Radeon Pro 5300 with 4 GB of memory in the low-end and mid-range models. The high-end model starts with a Radeon Pro 5500 XT with 8 GB of memory, and you can upgrade to a Radeon Pro 5700 with 8 GB for $300 or a Radeon Pro 5700 XT with 16 GB for $500. The more expensive options would be useful for graphics-intensive workflows, complex video editing, or developing 3D content.
Higher RAM Ceiling
All configurations of the 27-inch iMac start with 8 GB, but you can expand that to 16 GB ($200), 32 GB ($600), 64 GB ($1000) or, for the first time in the iMac line, 128 GB ($2600). Unlike on most other Macs, RAM is user-accessible through a panel on the back.
Increased SSD Storage
Storage is locked at 256 GB for the low-end model, whereas the mid-range model starts at 512 GB and lets you upgrade to 1 TB ($200) or 2 TB ($600). The high-end model also starts at 512 GB, offering the same 1 TB and 2 TB upgrades and adding 4 TB ($1200) and 8 TB ($2400) options. The Fusion Drive is no longer an option for the 27-inch iMac.
Better Video and Audio for Videoconferencing
Those who spend their days on video calls will appreciate the new 1080p FaceTime HD camera, a notable improvement on the previous 720p camera. Apple also says the 27-inch iMac now features higher-fidelity speakers and a studio-quality three-mic array for better audio output and input.
Improved Glare and Ambient Light Handling
The 27-inch iMac now offers a $500 option for “nano-texture glass,” which Apple says provides “better viewing under various lighting conditions, such as a bright room or indirect sunlight.” Previously, nano-texture glass was available only for Apple’s Pro Display XDR screen. The iMac’s Retina display also now supports True Tone, enabling it to adjust its color temperature automatically for ambient light conditions.
Finally, if you need the ultimate networking performance, a $100 option gets you 10 Gigabit Ethernet.
Overall, if you need a powerful desktop Mac with a gorgeous display, you can’t go wrong with the new 27-inch iMac. It’s significantly cheaper than the iMac Pro and more powerful than both the Mac mini and the 21.5-inch iMac. Just remember that some of the options are available only if you start with the high-end configuration.