Minimum CFMs for overclocking a 1.2 T-Bird?

[Massa2]

Maybe I'm missing something after reading through the threads on the PAL8045 and the wide variety of 80mm fan suggestions but I don't see any clear direction on what the minimum cfm's should be for overclocking. I'm looking for overclocking performance with serious consideration given to noise so I can get rid of my Dragon-screaming-freaking-jet- Orb 3.

Thank's folks.

 

[Massa2]

My #1 contender:

The Panaflo 80mm H1A's- specs are as follows: 80x80x25.5, 2.1 Watts, 39.6 CFM, 32 dB-A, .24A

Anything better with lower dba's??