I am building a system for my girlfriend with a Zalman CNPS5000 (not the CNPS3100 "flower") and the things is silent with the 100ohm resistor in place. It's a little pricey but but to bad for a full copper unit. 2Cooltek has it for $46 shipped via FedEx Express Saver. To use it you must have a mobo with the 4 mounting holes since it is too heavy to clip onto the socket. Be aware that the process is not foolproof. I am the fool that proved incorrect installation will lead to a toasted processor. Yup, 4 second is all that is needed.
There is also another silent model called the Noise Control Silverado. it's expensive as hell and hard to find in the US.
Windogg
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