Your Radeon RX 9000 GPU May Not Run At Full Speed On Ryzen AI 400

This story probably won't come as a surprise to anyone who pays attention to desktop APUs, but the news is simple: the new Ryzen AI 400 desktop processors that AMD just launched don't come with a full complement of PCIe lanes. In fact, they actually have even fewer lanes for high-speed I/O than some of the last-generation APUs, which were already quite limited compared to standard desktop processors. Let's get into it.

AMD's "Raphael" and "Granite Ridge" CPUs, the Ryzen 7000 and Ryzen 9000 desktop processors, have 28 PCIe lanes. Four lanes are siphoned off to connect to the motherboard "chipset", which is really a single chip that breaks out those four PCIe lanes into functions like SATA, extra USB, and indeed, more PCIe lanes. Motherboards are designed primarily based on these parts, which comprise the majority of Socket AM5 CPU sales.

Meanwhile, the Ryzen ...