I had a Zalman CNPS7000 installed on my P4G8X w/ my wk-52 2.4b SL6RZ running at 3.4GHZ and temp loaded at 65C, I replaced it w/ a SLK-900U w/ a 5000 rpm 80mm fan and bring it down to 56C loaded. The same Zalman 7000 also fit in my P4PE, but I was advised the Zalman fan I had wasn't intended for overclocking.