PCIe 4.0 support may be added to AMD’s AM4 motherboards
Last night AMD unveiled Ryzen 3000 series seven-nm processors excited the enthusiasts of the hardware world. These new processors are the first desktop models in the world that are produced with the seven-nanometer manufacturing process, so we can expect a reduction in energy consumption and heat production from them; But in addition to the mentioned improvements, AMD’s new processors also support PCIe 4.0 and bring another advantage to their manufacturing company against Intel.
AMD during its event at the CES 2019 announced that motherboards based on the AM4 socket will be supported until the end of 2020; Therefore, the new Ryzen processors will be compatible with current motherboards, but unfortunately, if using these motherboards, users will lose the possibility of using PCIe 4.0. On the other hand, motherboard manufacturers claim that they have successfully tested PCIe 4.0 on AMD’s 300 and 400 series motherboards, so we can hope that a small BIOS update will at least partially support PCIe 4.0. /p>
According to knowledgeable sources, after receiving a BIOS update, older motherboards will provide a 16-channel PCIe 4.0 connection in the first slot; But the rest of the slots are limited to PCIe 3.0 signaling rate; Because any trace routing beyond 6″ on the motherboard will require Redrivers and Retimers capable of supporting the faster PCIe 4.0 signaling rate. In this way, the closest PCIe slot to the CPU will easily support PCIe 4.0; While other slots, including M.2 ports will work with PCIe 3.0 signaling rate.
500 series chips will consume more energy than 28nm chips used in AM4 motherboards; Because these chips support PCIe 4.0 connection. Currently, there is no information about the type of channel allocation with the new chip; But the faster PCIe 4.0 channels will be beneficial in a variety of peripherals.
Although many manufacturers have tested PCIe 4.0 on older chips; But it is unclear whether AMD will allow them to add such a feature through a BIOS update or not. It is said that AMD can simply lock this feature, so the fate of the 300 and 400 series motherboards is still unknown. Radeon Vega VII graphics cards will be the first devices to fully utilize bandwidth. PCIe 4.0 will be used; Therefore, adding support for this connection – albeit in a limited way – to old motherboards will be very interesting.