8800gt fan speed won't change

[ajay000222]

Hey I have a 8800gt at stock clocks and lately its been overheating like crazy
so after a bit of investigation I noticed that the fan speed wasnt changing as the temperatures increased
Like I can change my fan speed on rivatuner and in the monitoring I'll see it change from 30% to 100% but the rpm will barely change

so after this i did a clean install of the latest drivers and when i first tested it by putting it through furmark, the rpm went right up to around 2500 as it should and the card temps were manageable.
so then i get into some crysis 2 and its all fine for a bit till my display turns off cus of temps. looks like once the fan speed went down during a loading screen it didnt go back up again. and i still have the same problem through rivatuner. And I've tried changing fans speeds through evga precision too but the results are the same. Also tried monitoring rpm through gpu-z and same results.

I put 2 images of my rivatuner below where you can see the fan speed percent changes but rpm barely does. The one on the left was a better case than usual and the one on the right is the norm
I also included a gpu-z screenshot

 

[ajay000222]

Update:
I tried rolling back my driver to 258.96 but that didnt help so i tried uninstalling and cleaning out the driver with the guru3d driver cleaner then installing the latest drivers again
in crysis 2 this time the fan spun up to 2500ish like before and temps were fine till while i was playing a bit later i glanced over and noticed my temps rising (above 100 even) and the fan rpm was around 7-800 so i shut out of the game. fans are at 1100 atm cooling my card back down
any reason my fan can't sustain high speed?

 

[ajay000222]

Any Ideas anyone?