What mean the jumpers and switches on those machines?
I don't know were to reduce the memory clock (25 --> 33).
At least it seems that the system is running unstable.
Sometimes I get internal compiler errrors and sometimes not.
Sometimes there are other errors and the next time a compilation runs
through. 

How can I test where the error lies?
Why does the system not crash in normal use situations?
Why just in compiler runs?

Can it be the overclocked processor as well? 

	Thanks Andreas