I am running a Freezer 7 Pro on a Q6600 G0 @ 3ghz and I get temps of 40c idle, 66c Prime95 load on the hottest cores. And that's with several very quiet case fans.
My setup is as follows....
Front - 120mm Akasa Amber (Speed reduced to inaudible with Akasa Fan Control Jr), Scythe Kama Bay with 120mm Akasa Smoky (1000 RPM) both as intake
Side - 80mm Akasa Amber (Speed reduced to inaudible with Akasa Fan Control Jr) as exhaust
Inside - Antec Spot Cool (Speed reduced to 2000 RPM in uGuru) hovering above the GFX card
On the board - 2 x 40mm Akasa Blue Led (Speed reduced to 3000 RPM in uGuru) on the Northbridge and PWM Heatsinks [also soon to include a OCZ XTC Memory Cooler over the RAM]
Rear - 120mm Akasa Amber (Full Speed) Thermaltake Cyclo PCI Blower (Speed reduced by Zalman Speed Reducing Cable) both as exhaust
This is all installed in a Jeantech Phong case (certainly not the best case and by no means roomy!). I also have a very silent Tagan TG480-U01 PSU and my 8800GTS is barely audible until gaming, and even then it's not bad. My HDD's are all Samsung Spinpoint, the quiestest disks available.
In fact, the noisiest thing in my system is the rear Akasa fan at full speed, and even it is rated at 18db, so it gives you an idea of how quiet I like things.
The only thing I found with the Freezer is that it can be noisy at full fan speed. Get decent airflow in your case and this won't be a problem anymore. I also have it's fan speed limited to 85% max in uGuru.