guys, noob question....

how to adjust fan speed of intel stock HSF? I try using TAT if under 100% load temp reach 75C!!! also i can hear the tiny whirrr of fan at that moment.......i think probably max fanspeed reached

but i wanna prolong my proc life so can I throttle my fan to run faster? (somthing like Rivatuner i can set my fanspeed 80/90/100%)

C2D proc, Gb ds3 mobo

Yes i know E6600 is better bocoz hv higher multiplier.. but i dont need 4GHz clock speed for now. Previously my E6300 can hardly reach 3Ghz, its alrdy sufficient for normal use. Really fast enough.
Reason i wanna get E6400 is just wanna get a proc tht can easily hit > 3.2GHz, thts all.. nothing more.
Moreover, i only need to op up RM60 to get a E6400 after i sell my E6300 with RM600. If E6600 i nid top up few hundreds.. sakit hati 
Just Oc for fun  and like goldfries said, Better proc is good for benchie, for normal use, E6300 got not much different with E6600. (rich E6600 user dont flame me ok  )