iMac Retina 5K (Late 2014)

The Late 2014 iMac with Retina 5K display was a genuine watershed moment for desktop computing: the first computer in the world, from any manufacturer, to ship with a 5K display, packing roughly 14.7 million pixels into the same 27-inch chassis Apple had used since 2012. That density, over five times that of 1080p, allowed for pixel-perfect 4K video editing with room for on-screen tool palettes, and made photo and design work dramatically crisper than anything rival all-in-ones or standalone monitors could offer at the time, at a price that undercut buying an equivalent standalone 5K panel separately, since none existed yet. Driving that many pixels required Apple to co-develop custom timing controllers with display partners and lean on AMD Radeon R9 M290X/M295X graphics, since no existing GPU or display pipeline had been built to handle a 5K signal at 60Hz. Under the hood, Haswell Core i5 and i7 chips clocked from 3.5 to 4.0GHz offered healthy gains in efficiency and integrated performance over the 2012 Ivy Bridge iMac, and Fusion Drive continued as a popular configuration. The result was a machine reviewers treated almost as a new category: not just an incremental iMac refresh but a legitimate showcase for what a modern all-in-one display could be, drawing comparisons to how the original Retina MacBook Pro had redefined laptop displays two years earlier. Photographers and video editors in particular embraced it as the first affordable window into true 4K-plus workflows. The main quirks were thermal and GPU headroom, since driving a 5K panel pushed the mobile-derived GPU options harder than prior iMacs, and the closed, non-upgradeable design continued Apple's shift away from serviceable desktops. Historically, this iMac cemented Retina as the future of the entire Mac lineup and set the visual bar that every iMac since, including the M1 iMac's smaller-but-still-sharp Retina 4.5K panel, would be measured against.