Centrises (Centrii?)

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Ha, I had the same thought.

The only Centris that was different from the Quadra of the same name would be the 610. The Centris ran a 20MHz 'LC040, whereas the Quadra had a 25MHz '040 - their motherboards were very different. Of course, everything else (drives, cables, casing, PSU, etc) was interchangeable.

The Centris/Quadra 650 and 660av were virtually identical, however, save for some different configurations of drives or memory.

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Apple underclocked the Centris 610. The parts are actually rated for 25mhz like in the Quadra and can be overclocked beyond that.

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I had (have?) a Centris 610 motherboard somewhere, and I remember distinctly that the CPU was marked for 20 MHz. Not to say it probably wouldn't go up to 25 MHz without issue.

I also remember reading an article about the Centris and Quadra 610. The boards were a little different when it comes to ethernet. The Centris 610 being 20 MHz, just used every other cycle for the 10 MHz ethernet controller. This ran in software via the ROM. The Quadra was 25 MHz so it needed a hardware solution (it's own clock and a small cache).