The Atari Jaguar was marketed as the first 64-bit console ever

Explanation

Atari launched the aggressive ad campaign "Do the math!" to highlight its two custom chips (called Tom and Jerry). It was highly controversial since the main CPU was actually 32-bit and the marketing strategy relied on the aggregate processing power of multiple chips rather than a true 64-bit architecture, making it misleading. It lost decisively to the PlayStation and Saturn.