Nvidia has a new version of the Ntune motherboard and graphics monitoring and overclocking tool. It is a stand alone installation pack and this new 5.05 version adds GPU temperature monitoring and overclocking for all motherboards. Nforce motherboards with specific BIOS support will only have the basic functionality.
Monitoring features are available for all Nforce 2, 3, 4, 5 and 6 series chipsets. The tool works under Windows Vista 32 and 64 bit and XP 32 and 64 bit.
You can download it here.