which GPU supports good Opencv with CL ?

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Hi,

I wanna buy a board with GPU, which can run OpenCV with CL. i have seen some boards, i found some boards with GPU which can support CL version 1.1 FULL Profile, and some boards which has GPU supporting 1.2 Embedded Profile, can any one suggest me a board which has good support of opencl, which can run opencv effectively. suggest me board or GPU . And one more thing, how i can i find max_work_group_size a gpu can support?

Thanks in advance, Shabuddin.