AMD partners could use the opportunity to launch some of the more upscale B550 motherboards with the latest 2.5 GbE wired LAN, and 802.11ax Wi-Fi 6. If the AM4 SoC installed is a 3rd gen Ryzen, then you'll get a couple more 10 Gbps USB 3.1 ports. The rest of the chipset's I/O will be similar to the 400-series, which includes six SATA 6 Gbps ports, up to two 10 Gbps USB 3.1 ports, up to four 5 Gbps USB 3.1 ports, and eight USB 2.0/1.1 ports. A 3rd gen Ryzen processor on a B550 motherboard still puts out PCI-Express gen 4.0 connectivity, which means you get one PCI-Express 4.0 x16 slot, and one M.2 slot with PCI-Express 4.0 x4 wiring.
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The chipset talks to the AM4 SoC over a PCI-Express 3.0 x4 link, and puts out up to 8 PCI-Express gen 3.0 downstream lanes. The only thing that sets this chip apart from the 400-series "Promontory-LP" is PCI-Express gen 3.0 certification. While the X570 is an in-house development by AMD, the B550 is sourced from ASMedia, and is expected to be a new version of the "Promontory-LP" silicon. The B550(A) will be an important chipset for AMD as it will enable motherboards priced under the $150 mark that support AMD's 3rd generation Ryzen processor's I/O natively.
This is the first time we've seen the mid-range chipset being referenced as "B550A" and not "B550." The "A" may not be part of the motherboard's model name as the "M" denotes Micro-ATX and usually succeeds the chipset model in ASRock's nomenclature. The board was spied inside a pre-built desktop at a Best Buy store. Here is the first picture of a motherboard based on AMD's upcoming mid-range desktop motherboard chipset, the AMD "B550A," the ASRock B550AM Gaming.
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