Embodiments disclosed herein include a package substrate. In an embodiment, the package substrate comprises a core with a first surface and a second surface, where the core comprises a glass layer. In an embodiment, a first routing layer is over the first surface of the core, where the first routing layer comprises traces with a first width. In an embodiment, a second routing layer is over the second surface of the core, where the second routing layer comprises traces with a second width that is smaller than the first width.