The B550 chipset is the heart of the Gigabyte B550M DS3H motherboard and has been specifically optimized for the Ryzen CPUs of the 3000 series (Matisse). B550 motherboards support all features of the Ryzen processors, foremost among them the PCI Express standard in version 4.0. PCIe 4.0 is backward compatible and can be used with all expansion cards from previous generations.