Seven-meter Ryzen 3000 series (Zen 2) processors announced yesterday are the first to The market will receive support for the PCIe 4.0 interface, which, along with improved energy efficiency, will give the new processors a “red” non-weak advantage over competing “blue” models.
In addition, AMD platforms, unlike Intel, have always been characterized by a long support period and the manufacturer confirmed once again yesterday that the new Zen 2 CPUs will be supported by existing motherboards with an AM4 processor socket with the proviso that PCIe 4.0 supports on the old motherboards will not.
But then, talking to representatives of several motherboard manufacturers, journalists of Tom's Hardware found out that it was possible to implement PCIe 4.0 support for existing motherboards on AMD 300th and 400th chipsets, though and not without limitations. In particular, by updating the UEFI firmware, manufacturers can make the first PCI-E x16 slot work in 4.0 mode. At the same time, the performance of the remaining slots and M.2 slots will remain limited by the PCIe 3.0 specification due to the long length of the tracks on the printed circuit board. That is, in order to unlock the full potential of the PCIe 4.0 controller built into the AMD Ryzen 3000 processors, you need a motherboard based on the AMD 500 Series logic chip. Otherwise, it is impossible to significantly increase the real bandwidth of other interfaces and ports.
Later, a representative AMD in a message to Tom's Hardware confirmed that motherboards on AMD 300th and 400th chipsets can actually support PCIe 4.0 . He also added that AMD does not intend to block this possibility, on the contrary, the "red" are going to contribute to the vendors in this matter and help with assessing the possibility of introducing support for a faster interface for old motherboards. But the final decision regarding the release of the corresponding BIOS update will be made by a specific manufacturer.
It remains to add that the AMD Radeon Vega VII video card will be the first device on the market that supports PCIe 4.0, which doubles the data transfer rate per line compared to PCIe 3.0 (from 8 to 16 GT / s (billion transmissions per second)). And the fact that old motherboards will be able to get support for PCIe 4.0, let it be limited, is certainly good news. By the way, the development of the next version of the PCI Express 5.0 specification, which will provide a performance jump up to 32 GT / s, is already in full swing.
Source: Tom’s Hardware