"NVIDIA is the world leader in power efficient GPUs, so I have every inclination to believe them. If they didn't have the GPU experience that they did, it'd probably be prudent to call BS."
[So, you are not going to let the significant number of times that Nvidia has over-promised in a reference design and under-delivered in the shipped product in the past stop you from drinking the Kool-Aid.
It's not about the GPU experience, it's about the track record.]