Well I had the Zalman CNPS9500 before on an FX57 overclocked to 3.1ghz, and it did it fine on min. setting and was barely audible. Just not sure it would be cut out to cool a 3.73EE Presler overclocked to 4.5ghz.
As for the Arctic Freezer 7 Pro. I am running one right now. Not sure what my temps are because the stupid bios on my Asus P5N32SLI-deluxe does not report temp's correctly on 9 series chips. Plus the Freezer is running at a continuous 2700rpm. The overclock probably needs it, but with C1 core stepping optimisations and Enhanced Speedstep enabled in the bios, the cpu runs at only 2.7ghz so you would expect PWM to kick in and drop the rpms to around 1000. It doesn't. And it doesn't work on my friends Asus PWWD2-E Premium Intel 975X mobo either. That is why I was considering the Zalman. It uses the 3 pin design and I could hook it up to my Akasa fan controller and adjust the rpm's manually. I still would not know the cpu temps, but I could always use a thermal probe on the base of the zalman between the heatpipes.
On another note, would you say the reason PWM aint working is because of crappy bios support for 9 series cpu's or is there an actual pwm circuit on my board that could have snuffed it. The reason I mention this is because the first time I ran my cpu I did not realise the bios was reporting cpu temps of 12 degrees. I enabled SmarFan which only runs the cpu fan at over 25 degrees. Bad mistake. By the time I realised something was up and attempted to power down, I heard an electrical fizzle during the power down cycle followed by a sort of ozone smell from the psu. Everything is working perfectly now though, in sli and all. I just wonder could I have killed whatever controls PWM. I guess the only way to find out is to buy a cheapo Celeron and plug in the stock cooler. Then again a friend with another Asus board has his AC7 Pro running at full whack by default too. So maybe it's a bios issue. I worry to much.
<edit>Where is the best place to put a thermal probe on a Zalman CNPS9500 ?</edit>
