I'm water cooling 6 5970s using an unique technique.
Two 250cfm fans into two Ice Box heat exchangers with water flowing from my washer hookup back to the drain (my neighborhood splits the water bill

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It cools down the room quite a bit. You can feel the water inlet tube and it is cold, the water outlet tube is hot like it should be, so that means it's working.

This setup has been running stable for over a month with no problems.




Random screen shot (Yes, I know two cores were sick/at 0 Kh... I have since fixed/replaced them.

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