The 12 cores are going to be in 1 CPU BTW. It's a limitation of the chipset and probably thermal capacity as well (check out http://www.intel.com/content/dam/www/public/us/en/documents/... ).

As far as 16GB dimms in standard sizes; that's already a thing: http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=...

There are also a handful of 32GB DIMMs out already. Example: http://www.newegg.com/Product/Product.aspx?Item=N82E16820326...

I would expect that you'll be able to run 64 or 128GB of RAM max.