I know Tom's article mentions that, but I'm not sure this is entirely true, as Anand has overclocked an i7 920 using an ungodly amount of voltage up to 3.8ghz, which has been pointed out in their comments. http://anandtech.com/cpuchipsets/int...px?i=3448&p=15
THG is not the most credible site IIRC, so there's still hope.
If the limit is 3.8-4.0ghz for budget chips, then it's not much of a protection anyway.. Anyone with some first hand knowledge?