do we need 128GB DDR4 now??

I have just managed to buy 96gb for my z800 for €260, inclusive!!
Does little happy dance!!!!!!
Now, Goerlitz or Doesberg?????????

Replying to first two posts:

I had also found recently while looking on Newegg, that many of the LGA 2011-v3 MB's take 128 gigs of memory. I also found that one can get 4- 16 gig modules for about $520 and 8- 8 gig modules for around $400. So it's not that much more to go with the 16's and have 4 more spaces left to add another 64 gigs later.

Eric

The 16 GB modules are gradually becoming more common. This also provides the ability to build B150/Z170 based sytems with a i7-6700K, but still 64 GB of RAM.

Gigabyte makes several motherboards that have 8 DIMM slots. The GA-X99-UD4 board is being firmware updated to allow it to use 16gb DDR4 dimms which would allow 128GB onboard.

Most X99 motherboards have 8 DIMM slots, only in the smaller form factors like M-ATX you find 4.
The Gigabyte you mention has one disadvantage, it has only one M.2 slot and only using 2 PCI-E 2.0 lanes. This is hardly faster than SATA. I should pick an X99 that has a 3.0 x4 M.2 slot, so you can enjoy Samsung 950 Pro SSD's and similar (now or in the future).