From my read of that Volta picture (here's a close-up glamour shot of the V100 module: https://devblogs.nvidia.com/parallelforall/wp-content/upload... ), that's just the chip module itself. Note how none of the interconnect hardware is present? The V100 supports NVLink just like the P100. When you actually assemble that chip module onto a board, it looks more like this:

http://hothardware.com/ContentImages/NewsItem/37034/content/...

(That's a P100 server, obviously, but it's the same kind of design. The P100 module looks a lot like the V100 module.)