The graphics chip that powered the original iMac

Science · Published 1 November 2026 Swipe more like this →

In short: Before modern GPUs dominated our screens, a specific piece of silicon bridged the gap between basic 2D images and complex 3D worlds. The ATI Rage series wasn't just a component; it was the engine behind iconic hardware transitions and early multimedia revolutions.

Released in April 1996, the original 3D RAGE (also known as Mach64 GT) was built upon a Mach64 2D core. It introduced critical 3D functionality and MPEG-1 acceleration to the market. This chip served as the foundation for ATI's early 3D Xpression video boards and became a staple in consumer hardware, notably integrated into the IBM Aptiva 2176 line. A complimentary version of MechWarrior 2: 31st Century Combat accompanied the hardware, designed exclusively for this specific chipset to demonstrate its capabilities.

The lineage evolved rapidly through several iterations designed for specific market niches. The second-generation Mach64 GT-B offered roughly double the 3D performance and added MPEG-2 (DVD) playback support. By 1998, the Rage IIc core became a cornerstone of Apple's history, powering the original iMac (Revision A). Meanwhile, the RAGE LT series pioneered mobile graphics by introducing low-voltage signaling for notebook LCDs and becoming the first mobile GPU to utilize AGP technology.

The series faced significant competitive hurdles as it matured. The 3D Rage Pro was marketed as a solid game renderer but struggled against rivals like Nvidia's RIVA 128 and 3dfx's Voodoo accelerators, partly due to an early lack of OpenGL support. Later, the RAGE 128 introduced 'Twin Cache Architecture' (TCA) to manage texels and pixels efficiently. While it outperformed some competitors in 32-bit color mode, it struggled with dithered 16-bit modes, illustrating the complex trade-offs between memory bandwidth and raw processing power during the late 90s hardware wars.

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