I would get a heatercore big enough for 2 120mm fans. I was running my 2-342 heatercore with one fan for a while, until I got the 2nd fan, and when I put it on I got a 2C drop at full load. And these are rather quiet Sanyo Denki's running at half speed. Not loud at all. Tomorrow I'll have to crank them all the way up and see how cold I can get.
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