I do apologise: I thought he still had one for the 605/475, but it appears not.
If the Overdrive is made to go in a machine of the same original CPU speed as your target (which is it - both the Centris 650 and the 475 run at 25MHz), it should work, but as you point out, clearance around other components and the case could be a problem.
It doesn't overclock the motherboard - the new CPU sits on a separate, upclocked bus by the look of it.
As far as the 575 goes, the same comments about speed matching and clearance issues apply.
On the other hand, if you were overclocking the 475 to 33MHz, then - barring space issues - one made for a 33MHz machine should work.
I think these cards base their timing on the host machine's bus, so that one designed to run at 50MHz in a 25MHz machine would be overclocked to 66MHz in a 33MHz machine. You might get away with that with supplemental cooling, but I wouldn't want to try it, especially as the 50MHz modules use overclocked 40MHz '040s to start with.
If the Overdrive is made to go in a machine of the same original CPU speed as your target (which is it - both the Centris 650 and the 475 run at 25MHz), it should work, but as you point out, clearance around other components and the case could be a problem.
It doesn't overclock the motherboard - the new CPU sits on a separate, upclocked bus by the look of it.
As far as the 575 goes, the same comments about speed matching and clearance issues apply.
On the other hand, if you were overclocking the 475 to 33MHz, then - barring space issues - one made for a 33MHz machine should work.
I think these cards base their timing on the host machine's bus, so that one designed to run at 50MHz in a 25MHz machine would be overclocked to 66MHz in a 33MHz machine. You might get away with that with supplemental cooling, but I wouldn't want to try it, especially as the 50MHz modules use overclocked 40MHz '040s to start with.