I am using RX 480 which I believe it would support OpenCL 2.0, when I tried the APP SDK 3.0 samples for example CalcPie.cpp it failed at this checking step
bool check2_x = deviceInfo.checkOpenCL2_XCompatibility();
OPENCL_EXPECTED_ERROR("Unsupported device! Required CL_DEVICE_OPENCL_C_VERSION 2.0 or higher");
I tried getting OpenCL 2.0 driver from AMD but the download links on AMD OpenCL™ 2.0 Driver are broken.