There was also a Centris 650 and a Quadra 650. Same deal. The Centrises used LC040's while Quadras used the full 040.

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While there were some versions of the Centris 650 that had LC 040 chips (these also didn't have ethernet), most had the full 040 and ethernet. You are right about the Centris 610 though - it had the 20MHz LC 040.