Systems and methods for re-mapping memory transactions are described. In an embodiment, a method includes receiving a memory request from a hardware subsystem to a memory, replacing a first identifier with a modified identifier in the memory request, and transmitting the memory request to the memory through a processor complex. The method further includes receiving a response from the memory, determining that the response corresponds to the memory request, replacing the modified identifier with the first identifier in the response, and transmitting the response to the hardware subsystem. In some embodiments, a system may be implemented as a system-on-a-chip (SoC). Devices suitable for using these systems include, for example, desktop and laptop computers, tablets, network appliances, mobile phones, personal digital assistants, e-book readers, televisions, and game consoles.