Many of you know I am having trouble with my G5. I want to rule out the CPUs. What will happen if I put a pair of 1.8Ghz CPUs in there? I know the 2.0 runs at 1000Mhz, and the 1.8s run at 900Mhz FSB. Will the 1.8s still work , lowering the FSB of the system to 900Mhz? or will it just fry my logic board?