I work with a NVIDIA GTX 560 that in your description show 336 Cuda Cores, however when i use clGetDeviceInfo or when i run OpenCL Device Query both return only 7 Compute Units.
Can This be a especific configuration or the board is with problem?
The card has 7, of what Nvidia call, Streaming Multiprocessors (SMs) which OpenCL
refers to as Comput Units. Each of thse (on that card) contains 48 Streaming Processors
(SPs, also called CUDA cores) giving you the 336 figure.