I purchased the Zalman CNPS-7000AL-CU, while it is relatively quiet, it seems mediocre in performance, on my P-4 3.0c cpu my temp readings are 43-44c idle, with the case cover off. I would highly suggest that you get either the Thermalright 947-U, or the SP-94 as Scottchen recomended.As i am going to purchase also,(any body want to buy any Zalman products one slightly used CNPS-7000AL-Cu? can't rma it as I had it sitting around for awhile also the CNPS6500B-Alcu,P-4 to 2.8Ghz, zalman heatpipe with fan, don't remember the model #.Both brand new never used.)