apple might be making better use of all the cpus in snow leopard....
so more processors might be better.
not enough testing.
i think there is software around to disable cores and test
something like this:
http://www.mactricksandtips.com/2008...-on-a-mac.html
there are also apples developer CHUD tools
in leopard it wasnt critical.
but cpu speed improved things.