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The manufacturer's application notes make it abundantly clear the the Heatlane Zen cooler, when run as intended without any direct cooling fan, is not designed to cool a P4 CPU that is being stress tested with a constant 100% load. This was verified in the testing with many configurations. When used exactly as directed -- web surfing, email, word processing, and playing music or DVDs -- the Heatlane Zen NC-1000 kept the P4- 2.53 processor well cooled and perfectly stable with virtually any combination of power supply and case fan speed in the test setup. Excellent case airflow should be an objective for all PC silencers, but those who wish to use the Zen (fanless) will want to pay particular attention to good case airflow......
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