Macintosh Quadra 610 (1993)
The Macintosh Quadra 610 and Macintosh Centris 610 are two closely related personal computers that are a part of Apple Computer's Quadra and Centris series of Macintosh computers, respectively. When the Centris 610 was introduced in February 1993 alongside the larger Centris 650, it was intended as the start of the new midrange Centris line of computers. However, that proved confusing, and the Centris 610 was renamed to Quadra 610 in October 1993, and the CPU was upgraded from a 20 MHz 68LC040 to a full 68040 at 25 MHz - although there was one configuration, the Quadra 610 8/160, that retained the 68LC040. The Quadra 610 was discontinued in favor of the Quadra 630 in July 1994.
via Wikipedia: http://en.wikipedia.org/wiki/Macintosh_Quadra_610