most cores or more processors ?

Hi,
Is it more interresting to have one processor 4 cores, or tow physical processor having each one 2 cores ?

I guess second solution is better due to bus access... but processors in PC wast 99% of its time to do a NOP operation (do nothing) so ....

what s the best then ...

1 processor with 4 cores
2 processor with 2 cores
4 processors mono-core

thx

>>5
>>4
>>5
Still copyfagging i see SFBE!