B-Unit :
Did you not bother to read the second page of your new Bible? Even the Q9400 is 6% faster than the Q8400, add to that the 9550 has yet MORE cache, and is a better OCer due to higher multi, and its no contest.
Yes, its worth it.
Well it is much better than the Q8400 - that I am not contesting - the poignant question is if you are going to spend $100 more to get it - why not spend a few more and get the i7 920? The boards are more expensive - but then you might be able to keep them quite a bit longer as well. That is why I don't consider the Q9550 good value - about its performance however you are right - technically the best of the C2Q's performance wise is the unlocked QX9650 or QX9770 (although some argue the 9650 is the best). The Q9650 has an even higher multiplier than the Q9550 - so it is the best option for C2Q extreme overclocking without spending $1000+. All of this is not what I was considering - I was only looking at what was a good deal - which is of course relative - so if you want max performance then of course you have to spend more - however if you want the best bang for the buck in gaming and you are on a budget - then I would save the ~ $100 premium on the 9550, get the Q8400 and spend the extra on the GPU (especially if crysis is the system demand) - or save it.
Of course my flaw here was assuming this was a gaming build, as I now see this wasn't specified even though crysis was mentioned - so if he is using this pc for other CPU heavy apps then maybe the 9550 is better spent money - my bad for assuming gaming.
Also lol to that bible comment
Actually just saw the wording in my first comment - it was very misleading - sorry bout that - I meant to say that the Q8400 was a better choice (what I forgot to say was: than the Q8200 because of the higher multi) Technically the Q9550 can probably OC a few hundred Mhz higher on air than the Q8400 (I have usually seen the Q9550 around 3.8-4 Ghz when pushed hard on air) - but water or Vapo would probably give the best discrepancies in result.