Some Ryzen 8000G APUs could drastically reduce SSD and GPU performance

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By Aprilia Reen

In brief: AMD announced its Ryzen 8000G-series desktop processors at CES 2024 earlier this month. Boasting Zen 4 core architecture and RDNA 3 graphics, the new APUs are made up of 4 SKUs: two high-end models based on Phoenix 1 dies, and two entry-level products based on Phoenix 2. New developments now suggest that the Phoenix 2 chips could support much lower SSD speeds and GPU performance compared to their Phoenix 1 counterparts.

Official specs published by Gigabyte for its B650E AORUS ELITE X AX ICE motherboard reveal that the two Phoenix 2 chips in the lineup, the Ryzen 5 8500G and Ryzen 3 8300G, will offer only PCIe 4.0 x4 functionality for discrete graphics cards, while the Phoenix 1 APUs, the Ryzen 7 8700G and Ryzen 5 8600G, will support PCIe 4.0 x8.

It’s a similar story with the M.2 lanes, which will be cut from PCIe 4.0 x4 in the two Phoenix 1 chips to PCIe 4.0 x2 for Phoenix 2, virtually halving SSD performance. This means the two lower-end 8000G chips will only be able to run a PCIe 4.0 SSD with two lanes instead of four and external graphics cards with just four lanes instead of 8 or 16, which are supported by most modern desktop platforms. Unlike Ryzen 7000, none of the 8000G APUs support PCIe 5.0.

Some Ryzen 8000G APUs could drastically reduce SSD and GPU performance

The support for fewer PCIe lanes is expected to have a negative impact on the SSD speed and discrete GPU performance, especially if you are looking to install high-end components. It shouldn’t, however, be an issue for entry-level graphics cards, many of which still only support 4x PCIe 4.0 lanes anyway.

Reports claim that AMD had originally listed only single-channel memory support for the Phoenix 2 APUs, but that has since been updated to show dual-channel memory support for the 8300G. While a single channel would have still offered enough bandwidth to run the iGPUs, it wouldn’t have been enough to extract full performance out of discrete graphics cards, so dual-channel support is definitely good news.


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