The high end XPS 15 currently uses the Skylake-H, and will probably also use the Kaby Lake-H (quad core) as opposed to the U dual core, and we don't know if tha

The high end XPS 15 currently uses the Skylake-H, and will probably also use the Kaby Lake-H (quad core) as opposed to the U dual core, and we don't know if that will have higher RAM support