Fan control should be there...
If you are unable to locate it, try using Rivatuner
to tone it down.
If your card has aftermarket cooling or a manufacturer specific cooling package however, you may not be able to change it at all.
Not sure I would want to slow the fan down, though.
It is probably spinning fast for a reason.
to check you idle and load temps.
The maximum rated temp for your card is 105°c but you should try to keep it quite a bit under that.
If your idle temps are over 75° or so and your load temps are edging up on the 95°+ range, you defiantly need to rework your cases cooling setup.