Titan X is the product line which has multiple generations, with the Pascal architecture being the latest.

The benchmarks on the Titan-X are taken from a 2015 paper, thus they are definitely testing the older Maxwell (as opposed to Pascal) GPU. The FLOPS and memory bandwidth differences are significant.

So many of us on HN have access to early samples and we're so spoiled that we lose sight of what "current" hardware is. ;)