If that's a dual-processor system ("Centrino Duo"), have you got a kernel that can run more than 1 processor simultaneously? I'm not quite sure if a 1-processor-kernel (where SMP is disabled) can run on 2-processor environment, but you could try using an SMP-kernel instead, if you already haven't (I've got no idea if FC4 uses SMP-kernel by default in your case).
Have you tried Google?
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