https://wccftech.com/amd-b650e-b650-motherboards-amd-ryzen-7000-cpu-ddr5-memory-overclocking-support-october-launch/

Although AMD revealed its 600-series AM5 platform including X670E, X670 & B650 motherboards, they didn't go into detail regarding the feature set a lot. We have managed to get information from our own sources who also point out the B650E chipset and some of the features you can expect.

As a part of the AMD 600-series AM5 family, the AMD B650 motherboards will come in two flavors, the standard B650 and the B650E (Extreme). As is the case with the X670E and X670, the 'E' variant will feature all-around support for PCIe Gen 5 for discrete graphics & NVMe storage. The standard options will allow PCIe Gen 5.0 support only for the NVMe storage. However, bringing PCIe Gen 5 support for the storage will increase the adoption rate of next-gen Gen 5 NVMe SSDs which AMD & Phison are working on right now.