How can I change the speed of my GPUs fan?

It is a 7300GT 512MB. I'm not able to do it through nVidia Control Panel. I don't think Riva Tuner can do it either.How can I change the speed of my GPUs fan?
download this: its a must have from nvidia directly. and works perfectly with their cards





The NVIDIA System Tools installation package includes:



1. NVIDIA Performance Group (v6.02.08.01) add-on to the NVIDIA Control Panel



nForce MCPs

?Enables system tuning and profiles for clocks, voltages, timings, and fans

?Includes support for Enthusiast System Architecture (ESA) components

?Displays detailed system information





GeForce GPUs

?Enables GPU overclocking

2. NVIDIA System Monitor (v6.02.08.01) standalone application

nForce MCPs

?Enables system monitoring for clocks, voltages, timings, and fans

?Includes support for Enthusiast System Architecture (ESA) components





GeForce GPUs

?Enables GPU temperature monitoring

3. NVIDIA System Update (v2.00.41.05) add-on to the NVIDIA Control Panel

Automatically checks for nForce and GeForce driver updates

Adds ability to update your system bios

Includes support to update firmware of Enthusiast System Architecture (ESA) components



http://www.nvidia.com/object/nvidia_syst

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