AMD announced Ryzen 8000G AM5 desktop APUs in two variants: the 8700G/8600G based on the Phoenix 1 architecture and the 8500G/8300G based on the Phoenix 2 architecture. However, Phoenix 2 chips will have some limitations compared to PCIe lanes. This may limit their application to budget platforms.
Judging by the specifications of the new Gigabyte B650E AORUS ELITE AX ICE motherboard, AMD Ryzen 8000G Phoenix 1 chips support 8 PCIe 4.0 lanes for discrete video cards and 4 PCIe 4.0 lanes for M solid-state drives. Dual-channel DDR5 RAM is also supported, which is recommended for expansion of capabilities of integrated graphics processors RDNA 3 (Radeon 700M).
At the same time, for Phoenix 2 crystals, these possibilities are cut in half. According to the specifications table, such chips support only 4 PCIe 4.0 lanes for discrete video cards and only 2 PCIe 4.0 lanes for drives. It also says that only single-channel RAM is supported, but this is most likely a typo.
Both versions of the AMD Ryzen 8000G chips do not have PCIe 5.0 x16 support for discrete video cards, which the Ryzen 7000 (Raphael 1) desktop processors can boast of.
8 PCIe 4.0 lanes should be enough for most high performance graphics cards. However, the truncated support for SSD PCIe 4.0 x2 and 4 lines for video cards can be considered a disadvantage of Phoenix 2 chips. AMD itself indicates a total of 20 (16 available) PCIe 4.0 lines for Phoenix 1 versions, but Phoenix 2 has only 14 (10).
Source: wccftech
