I think in the world if Intel CPUs boxed/retail is a far better deal than OEM. First you get the stock fan, which is good enough in many cases to do a good job at overclocking (not as good as some you can buy, but unless you are trying to break records, it should do the trick).
Second, as you can see reading these forums. Some chips overclock better than others. So would you like a chip that has been sealed since it left Intel? Or one that the dealer might have tested and decided it wasn't good for OCing and sold as OEM instead? I am not saying this is that likely, but why risk it?
As to the question of which chip is better, I ordered the 1.8A yesterday and from what I have read I would guess I have about a 90% chance of getting 133fsb. I think your odds drop significatly with the 2.0A maybe 50-60% of making that magic 133fsb overclock. On the other side of things if you dont like the risk of either grab a 1.6A and have almost a guaranteed overclockable chip.
I guess the question is how much do you want to gamble, each step up is a longer shot. But the bigger the risk the greater the returns.
note: Im sorta making up the odds here, if anyone thinks they have a clearer idea of what % of 1.6,1.8, and 2.0 chips can make the 133FSB please let me know.
