nvidia did not acknowledge anything. They basically stated that the Vram Gate is by design. A Petition against nvidia has been started at change.org for compensation from nvidia to 970 owners. I don't want you to invest in expensive tech that might not be worth your money.
https://www.change.org/p/nvidia-refund-for-gtx-970
http://www.pcper.com/news/Graphics-Cards/NVIDIA-Responds-GTX-970-35GB-Memory-Issue