In a press release Zotac announces a new overclocking tool: With Firestorm a software based overclocking should be possible.
Zotac publishes overclocking tool
Zotac's new tool Firestorm is said to allow a simple, software based overclocking of graphic cards. The tool supports Zotac graphic cards of the series Geforce 8, 9 and GTX.
With Firestorm you can adjust the core, shader and memory cycle frequency as well as the fan speed. Furthermore reading out the GPU temperature is possible. The tool is available for Windows XP and Vista.