Yes they are, with a good motherboard & RAM, and your water-cooling you should be able to get to 3.6GHZ easily. If you get as lucky as you did with your Pentium D you might get 4.0GHZ.
I can't recommend 680i motherboards anymore unless you want to go SLI, which I also don't recommend unless you have money to burn. A P35 motherboard is the way to go right now. Asus P5K boards and the Abit IP35 boards are top performers right now. I can vouch for the fact that the P5K Deluxe is a great overclocker.
So far I've got my 6420 at 3.4ghz on air (Retail Intel fan 1.4v) waiting to push it higher. I stopped pushing it not because of temp or voltage issues but because I'll waiting to install my aftermarket heatsink before I get treal serious.
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