Yep tested on another system with amd vcard and everything ok. I think that the problem could be the nvidia driver, now i'm downloading the latest. Cinema R20.028 Corona B2RC3
Update: nvidia drivers updated, now it crashes when render in viewport with antialiasing>2; fine in vfb and ir. Tested with 1080 and 970. No problems with amd.
Another problem with PPM caustics - crash if selected