Mikhailtech take a looks at Thermaltake's spiffy 2nd generation fan, originally dubbed the "Smart Case Fan 2".

Almost 76CFM at 4800RPM is very good for an 80x80x25mm fan, but then again the noise level at that RPM is pretty high, though not as high as the Delta FFB0812SHE fan which is 80x80x38 mm and pushes "only" 68CFM. The good thing about the Smart Case Fan 2 is that you can choose to lower the RPM so that the noise level is more bearable. I would say that around 2800-3000RPM is the optimum noise/CFM ratio, but I'd rather run the fan at about 3500 RPM for a bit higher CFM.