There is no such hard limit at OCL runtime level. The actual number may vary depending on OS, driver, system resources etc. It’s always recommended to check the API return status instead.
Yes, I am aware of the fact that this limit does not originate from the OCL runtime.
That's why I mentioned that I've hit this limit on NVidia GPU and am asking what is that limit on AMD GPU.
OS: Windows 10, 64 bit