Before continuing,please have a look at the GPU FAQ
http://helpx.adobe.com/photoshop/kb/photoshop-cs6-gpu-faq.html
If the OpenCL checkbox is dimmed,it means Adobe GPU sniffer found a problem with the driver and disabled opencl. In that case you will have to wait for a new release. Are you sure your work in Photoshop depends on this? If not,you can wait for the next release.
You can also try NVDIA beta drivers. Here's what it looks like on the NVDIA's english site. Maybe the Chinese site has the same.
North America
Europe, Middle East and Africa
Asia Pacific