My choice would definitely be the NV silencer 5. In my case at least, it happily overclocks to Ultra speeds using it and stays at the same of lower temperatures than the stock GT. On top of that it's very quiet and exhausts hot air from the case instead of dumping back in like stock. I've also thought about the Danger Den block, but from what I hear, it's not going to do much to improve overclockablilty. It also dumps quite a lot of heat into the rest of the cooling loop. I guess it depends on your priorities when water cooling. I would rather get as much speed out of my CPU and not complicate it with the DD cooler in there. The clincher for me was the NV silencer 5 costs 1/5 as much as the DD block for just about the same result.
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