Vray RT "Unsupported GI is disabled"

[tomaeduard]

Hi, I have a problem with active shade vray rt .

1. I have an i7 (4 cores, 8 threads), 8GB RAM, GTX 970 4GB. Until now the turn only to the processor. I would like to know why when I set to "Assign Renderer" V-Ray RT and active shaded Engine type CPU work fine. I change engine type to CUDA or OpenCL and I receive error "Unsupported GI is disabled, but V-Ray RT always uses GI"

We looked how to enable it, but I found only adv, not here. You know what's the problem?

2. for final renderings V-Ray Adv or RT ? and are diferentele.Processor i7 8 threads with video card would you compare?

THANKS !