http://pcpartpicker.com/parts/compare/noctua-case-fan-nff12industrialppc2000%2Cnoctua-case-fan-nff12industrialppc2000pwm%2Cnoctua-case-fan-nff12industrialppc3000pwm/
The 3000 RPM version has a rated static pressure of 7.63 mm/H2O.
The two 2000 RPM versions have a rated static pressure of 3.94 mm/H20
For comparison, the SP120 HPE is rated at 3.1 mm/H2O and the NF-F12 is 2.61 mm/H2O.
For Noctuas, these are going to be a lot louder - the 2K version is rated at 29.7 dbA at max, and the 3K is 43.5 dbA.