People, I bought this riser http://goo.gl/6x1a9v
and went test with one single GPU (HD 7950) on mobo H61M-S1. The mobo don't works well. Turn on but then turn off or turn on and don't recognizes the GPU. And now, without riser card the mobo just shows video using the onboard video. I tested 2 different GPUs and the problem continue. Just works using onboard video.
Then I will test on other mobo and occurred the same error.
And now? Help-me please!