What are your temps at 1.36? If there is significant temp increase at 1.4 i'd say it is not worth the 0.04 incease for just 100mhz - which wont matter in any real application anw-
I wouldnt say you are risking the life of your chip but when higher ambient temps occur you might have much higher temps and throttlebacks.
At 1.4v you are usually more prone to damage from power flactuations aswell.
If it makes you feel any better, you are going a little bit over 4 ghz.
For me 4 ghz is the milestone. However, if you want 4+, for whatever reason, then use 1.4. It's a little high, but you are not going to fry your chip. So, screw whether it is worth it or not in a strictly performance sense. If it makes you happy, then just do it. (And make sure you have good case ventilation as well.)
i'd have to say that anything past 3.6 is not too much of a benefit anyway.
I tested many different games/apps @ stock/3.6/4.0 on my E8400 and the jump from 3.0 to 3.6 is quite substantial in comparison to the little gain i got from 3.6 to 4.0.
In fact, some apps/games ran worse @ 4.0 than 3.6.
I agree, 4ghz is only good for bungholio runs and little else.
The 45nm C2D chips seem to have a sweet spot at 3.6Ghz around 1.29/1.31 v (Chip dependant) when it comes to performance against power use and heat production, but then this is always the case with overclocking your Cpu, the higher end of overclocks always create much more heat and use more power than the speed you get from it in return, To be fair though, I personally think 3.8Ghz is the best balance if you want the speed but want to stay within the 1.36v limit set by intel, I am happy with that and also know that it will run stable even on the hottest summer day! (Although I will probably be outside enjoying that day instead of sitting in front of my PC)
Loads of peeps run 1.4/1.45v on 45nm C2d Chips and not many fail, so it should be a safe enough practice, but cooling is essential at that speed and really, why? Ive long learnt that it matters not the speed of your processor, but the way you use it!