The introduction of the 610 brought on a never-before-seen, low-profile case that debuted the appearance of a new and unusual nub-like power button on its front panel -- previous Macs had never before used this type of on/off mechanism! The Quadra 610 differed from the similar Centris 610 in that it sported a 25MHz processor, as opposed to the Centris' 20MHz. Additionally, most Quadra 610 models boasted a true 68040 processor, which could easily accomodate an FPU. Current used market value of a 8/160 configuration: $375