Despite June 10th availability, the NDA has been lifted:
Tom's Hardware - http://www.tomshardware.com/reviews/nvi ... ,4585.html
Guru of 3D - http://www.guru3d.com/articles-pages/nv ... iew,1.html
Hardware Canucks - http://www.hardwarecanucks.com/forum/ha ... eview.html
Linus Tech Tips - https://www.youtube.com/watch?v=rkiZdSBux9E
HardOCP - http://www.hardocp.com/article/2016/05/ ... 0uaDJErLA8
PC Games Hardware (Deutsche) - http://www.pcgameshardware.de/Nvidia-Ge ... s-1196360/
Overall, it seems to just slightly edge out the Titan X / 980 Ti at stock. However, after you OC, the big Maxwell seems to have the advantage.