Sleds for operation in racks of data centers are disclosed herein. A sled includes a circuit board substrate, one or more physical resources, and one or more memory devices. The circuit board substrate has a top side and a bottom side arranged opposite the top side. The one or more physical resources are coupled to the top side of the circuit board substrate. The one or more memory devices are coupled to the bottom side of the circuit board substrate. Additionally, the sled includes a connector to electrically couple the one or more physical resources to the one or more memory devices.