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Water 3.0 Ultimate low RPM pump


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I just purchased a 3.0 Ultimate to replace my CM Glacer 240L, which had a pump failure. My motherboard is the ASUS Rampage V Extreme. The pump is plugged into CPU_FAN, and the fans are plugged into Chassis Fan 1A. Both Speedfan and Fan Xpert are reporting the max RPMs for the pump to be ~1850 RPMs, however the spec clearly shows 3600 +- 150. 


Any idea why it's so low?



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