Well if you read the link i posted, he found that he could get a slightly higher overclock on a few chips.
Memory bandwidth goes up as well, so faster overall system.
Some intel boards don't have a native 1333fsb strap when you overclock them, so you are overclocking the northbridge as well, northbridge overclocks are limiting in a few cases. So with a higher fsb strap, the nothbridge isnt as overclocked as much and can open the possibility of reaching a higher oc.
Quite a number of cheapish boards dont let you hit that oc, some dont allow oc, this helps out.