4th Gen Intel Xeon Scalable Sapphire Rapids Leaps Forward

This is odd looking RAM:

https://www.servethehome.com/wp-content/uploads/2023/01/Supe...

Why is the top half of each DIMM blank? Anyone know what the story is there?

I'm still drooling over the total count of 32 sockets, the future is nice.

Edit: Looks like it might be low capacity DDR6?