Technologies for network interface controllers (NICs) include a computing device having a NIC coupled to a root FPGA via an I/O link. The root FPGA is further coupled to multiple worker FPGAs by a serial link with each worker FPGA. The NIC may receive a remote direct memory access (RDMA) message from a remote host and send the RDMA message to the root FPGA via the I/O link. The root FPGA determines a target FPGA based on a memory address of the RDMA message. Each FPGA is associated with a part of a unified address space. If the target FPGA is a worker FPGA, the root FPGA sends the RDMA message to the worker FPGA via the corresponding serial link, and the worker FPGA processes the RDMA message. If the root FPGA is the target, the root FPGA may process the RDMA message. Other embodiments are described and claimed.