Cinebench OpenGL benchmark is a rather nonsense bench, for this reasons:
1º because it's not an optimized bench.
2º All of my 4 cores are used less than 60%. some of them even less than 40% in 4 tests i've done.
3º The GPU is used less than 50%
4º because in the latest drivers, AMD has implemented something called "chill" that enables the GPU to only show up to 60fps in (which is my case), and this is done with the main purpose of use less power and maintain the GPU better cooled.
there is not a way to disable that option the get the best result there. My result is utterly useless since i know and can probe that this test is not getting the best of my hardware, so no point in posting my result.