AMD Raphael sticks with PCI Express 4.0 and has dual-channel DDR5 support

Posted on Friday, August 20 2021 @ 21:23 CEST by Thomas De Maesschalck
More documents from the Gigabyte hack have leaked, this time there's a bunch of information about AMD's future Raphael platform. Raphael is AMD's Zen 4-based desktop processor, this model will use Socket AM5.

While Intel's upcoming Alder Lake-S will support both PCI Express 5.0 and DDR5, AMD's Raphael will support only the latter. TechPowerUp reports AMD's AM5 processors will support a total of 28 PCI Express 4.0 lanes.

Sixteen are used for PCI Express discrete graphics, four for a CPU-attached M.2 NVMe storage slot, four for the chipset bus, and the remaining four are used for a discrete USB4 controller. Alternatively, the latter can be used for more NVMe storage on boards that lack USB4.

For comparison, Intel's Alder Lake-S has 16 PCI Express 5.0 lanes for discrete graphics, but everything else remains on PCIe 4.0. On the memory front, AMD Raphael will support dual-channel DDR5 memory.
The other SoC-integrated I/O, as well as I/O from the chipset, appear to be identical to "Vermeer," with minor exceptions such as support for 20 Gbps USB 3.2x2. The Socket has preparation for display I/O for APUs from the generation.
AMD Raphael platform

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Thomas De Maesschalck

Thomas has been messing with computer since early childhood and firmly believes the Internet is the best thing since sliced bread. Enjoys playing with new tech, is fascinated by science, and passionate about financial markets. When not behind a computer, he can be found with running shoes on or lifting heavy weights in the weight room.

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