Before revision: Intel's version of this is the "Platform Controller Hub" (PCH) while AMD's version was called Fusion Controller Hub (FCH; this name stopped being used with the release of the Zen architecture), effectively an enhanced southbridge for the remaining peripherals—as traditional northbridge duties, such as memory controller, expansion bus (PCIe) interface and even on-board video controller, are integrated into the CPU die itself (the chipset often contains secondary PCIe connections though).
After revision: Intel's version of this is the "Platform Controller Hub" (PCH) while AMD's version was called Fusion Controller Hub , which is effectively an enhanced southbridge for the remaining peripherals—as traditional northbridge duties, such as memory controller, expansion bus (PCIe) interface and even on-board video controller, are integrated into the CPU die itself (the chipset often contains secondary PCIe connections though).