say what you will, but with coolchip blocks I took a CPU down to -20C
I use em on all my machines. I wont buy a Senfu or Aqua stealth anytime soon.
Coolchip is having some mfg problems right now but only with thread fittings. The blocks I get are always flat, smooth, and cool well.
The block I am not sure abou is the liquid radiation one... havent tried it yet.
You can try OC Hideout but there has been a good bit of complaining about quality and business ethics there.
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C-ya
Joe