how to get the information about GPU?

How can we get information about GPU in linux?
I would like to know numbers of GPUs, and its core, its buffer, latency, etc.

I have inserted the command lspci which outputed as:
01:00.0 VGA compatible controller: nVidia Corporation G94 [GeForce 9600 GT] (rev a1)
is there any information regarding above query?? I don:t so?
In linux how to get device information from C++ languages/

I would be glad to get your opinion concerning any of the above query.
Thank you…

You want to use the cudaGetDeviceCount() and cudaGetDeviceProperties() functions. See the deviceQuery example in the SDK.