The reason why I don't take unlocking seriously is because the odds are significant that the unlocked cores will have a defect.
4 average cores will be faster than 2 fast cores if the game is multithreaded, which most modern games are.
But then again, if you feel lucky, you can try unlocking, but I think you'll need a more modern board and BIOS.
so? the x4 630 has no L3 which renders the cpu slower then the same phenom II equivalent.
if he needs a quad, then he should go for the 630 but if he doesn't then he should go for the x2, the bonus is that he can try and unlock the other cores. remember it is all about statistics, they take a number of cpus from each batch, if more then x percent of them have defective cores, then they disable the entire batch's cores depending on the amount of defected cores statistically.
about the 70%, is it way more lower, aim more towards the 40%-30%
Dont buy a proc on the hope you might be able to unlock the 4th core, youll be pissed and let down if you cant, I got lucky, I unlocked and clocked my 435 triple, its a gamble so if youll be happy with the proc in its original form, if yes then go for it, an unlocked 4th core is a bonus, as Clint would say....
The OP is correct in that the 550 is a beast, even as a dual-core.
And the benchmark he posts is illuminating, if flawed.
There are a few things that should be taken into account when looking at that benchmark.
o The 550 was overclocked more than the 620.
o The 630 is more capable than the 620 (which was used in the benchmark).
o This is just one data point.
The last thing to consider is how future-proof a quad-core is compared to a dual-core.
If you are going to be playing a lot of Crysis, go with the 550. My guess is that games are going to be better tuned to play with quad-cores in the near-future, however.