Need more info on your system, pump, block(s), fans, ect... it's not a simple straightforward thing. Another rad might help. generaly the more cooling area of a rad the better. can your pump handle the extra flow/work required though?...
Is the rad the bottleneck in your system?. what CPU at what MHZ & Voltage are you running?. what CPU temps and ambiant (not system/mobo!!) temp is your room at?...
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