iMac Pro (2017)

The iMac Pro was Apple's answer to years of professional users clamoring for a true workstation-class all-in-one, and it arrived wrapped in a striking new space gray finish that visually distinguished it from every consumer iMac before it. Built around Intel's Xeon W processors ranging from 8 to a staggering 18 cores, paired with AMD Radeon Vega Pro graphics and up to 128GB of ECC memory, it was, at launch, the most powerful Mac Apple had ever shipped, aimed squarely at video editors, 3D artists, scientists, and machine learning researchers who needed serious sustained compute in a single self-contained package. Apple engineered an entirely new thermal architecture for the 27-inch Retina 5K chassis to keep those workstation-grade chips properly cooled, and it also marked the debut of the T2 security chip in an iMac, handling encrypted storage, the "Hey Siri" always-on listening pipeline, and ISP tasks for the camera. Notably, the iMac Pro arrived while the "trash can" Mac Pro was still languishing without updates, and many pro users treated it as a stopgap, and in some cases a genuinely superior option, filling the modular Mac Pro's absence with an incredibly capable, if non-expandable, all-in-one. Reception was largely enthusiastic: reviewers marveled at benchmark scores that rivaled dedicated tower workstations costing far more, while acknowledging that the fundamentally sealed, non-upgradeable all-in-one design was a real limitation for buyers who might want to swap GPUs or add storage down the line as workloads grew. The space gray aesthetic, matching space gray keyboard, mouse, and trackpad, became an object of desire even among people who didn't need its horsepower, and it directly foreshadowed the design language later carried into the Mac Pro 2019 and various pro-tier accessories. Apple ultimately discontinued the iMac Pro in 2021 without a direct successor, as the arrival of Apple Silicon and the Mac Studio made a Xeon-based all-in-one unnecessary, cementing the iMac Pro's legacy as a fascinating, powerful, one-generation-only bridge between the Mac Pro's darkest days and Apple's own-silicon future.