vga monitor refresh rate overclock

[turu]

Hi guys

I've got e-machines e17t6w monitor with 75hz standard refresh rate @ 1440x900
i must overclock refresh rate how high i can bcz i play online fps games , higher hz - better game performance , you know.

i've got geforce 9600 gt with 304.48 driver

windows 7 64 bit

i installed the tempest monitor drivers (Tempest X270OC)

patched with nvlddmkm-patcher-1.1.5 (and 1.1.6 too..)

and @ nvidia control panel , at ALL resolutions i can set only 78 hz (142.3Mhz)

at 78hz monitor works , but when i set to 79 or 80 or 120 or 96.. you know i see a black monitor with
"FREQUENCY OUT OF RANGE" title...

how to set this monitor to higher refresh rate ?

Can i oc this monitor for 85hz maybe? Please for fast respond , waiting for experienced guys replies

Thanks , turu.