The newer PC with a Phenom II X4 965 and 8GB Ram will blow away the Athlon 64. The athlon is only has one Processor on it's die and it's clocked @ 2.0GHz. Not only is the Phenom II X4 965 clocked @ 3.4GHz, but it also has 4 Processors on it's die. I would give a estimate that the new CPU performs 4x better than the Athlon.