Hi,

I don't know how compatible the two models are, but what about getting an iMac 1.25 GHz logic board and just replacing the existing 1.0 GHz one? It seems easier (and safer for the machine) to do that rather than mess with delicate resistors, and you would instantly gain that extra 25% in speed (not to mention any other improvements the faster board may have).

Just my 2 cents.

c