regarding fan

i have a quick question.
I bought an extra 140mm fan that's suppose to give 1000 +/- 200 RPM Air Flow.
it is connected to MOBO using 3 pin and it reads 732 RPM on HWMonitor.
how do i get it up to 1000 +200 RPM instead of 1000 -200rpm i'm getting now?

You can't.

the only thing you can do is go into bios and disable the fan header the fan is installed on, this will run it at 100% all the time.
I think mr. scott is right.