The first iMac, model M4984, shipped in August 1998 and was discontinued in January 1999. It had a PowerPC 750 (G3) processor running with one core at 233 MHz. It was Bondi Blue and seemed more like a piece of candy than a computer.
In January 2002, Apple traded in the iMac's CRT for a flat panel, introducing model M6498 in January 2002. It also had a single-core processor, but this PowerPC was a 7450 v2.1 running at either 700 or 800 Mhz.