Overclocking G4 memory speed

Since xlr8yourmac.com hasn't been accepting new registrations for several months now, it seems I will not get the chance to ask this there, as it seems the right place to do so.

Anyway, has anyone tried overclocking the memory speed on thier G4? mine runs 133Mhz, but there are 166 and 187 pieces out there. If I do:

CL2 would have a better chance than CL3, correct?
what other systems on the bus would be affected, and is there anything to do about it?

Thanks

Tom