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
AMD
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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