I just bought a used G5 2.5GHZ Dual Core Mac (M9457LL/A) and when I go to "About This Mac" it says it's got a single processor. Is this correct? It's replacing a G5 2.0 GHz Dual Processor which says it has 2 processors. Does Apple consider dual cores to be single processor. My concern is that I got what I paid for, and that it will be faster than my 2.0 GHz dual processor. Thanks.