We've mentioned the pending AMD B450 chipset details in our Ryzen gen2 review already really, but two new slides surfaced showing the final details.
AMD is to launch a lower classed (budget) B450 chipset, only the X470 chipset is going to support SLI. That means the B450 does not (but does support Crossfire). The B450 will be a more budget aimed choice, which makes a lot of sense. Please notice that you will get your standard 20 PCIe 3.0 lanes pulled from the Ryzen processor. Ryzen all by itself has 24 PCI-Express lanes, 4 are being used to interface with the B450 or X470 chipset (which adds Gen 2.0 lanes as shown in the table). So depending on the chipset used it adds a number of gen 2.0 PCIe lanes through the chipset.
| X470 | X370 | B450 | B350 | A320 | X300 / B300 / A300 | Ryzen CPU | |
| PCIe 3.0 | 0 | 0 | 0 | 0 | 0 | 4 | 20 |
| PCIe 2.0 | 8 | 8 | 6 | 6 | 4 | 0 | 0 |
| USB 3.1 Gen 2 (10 Gbit/s) | 2 | 2 | 2 | 2 | 1 | 1 | 0 |
| USB 3.0 | 6 | 6 | 2 | 2 | 2 | 2 | 4 |
| USB 2.0 | 6 | 6 | 6 | 6 | 6 | 6 | 0 |
| SATA 6 Gbit / s | 4 | 4 | 2 | 2 | 2 | 2 | 2 |
| SATA or NVME Raid | 0/1/10 | 0/1/10 | 0/1/10 | 0/1/10 | 0/1/10 | 0/1 | - |
| Overclocking | Yes | Yes | Yes | Yes | - | X300 Yes | - |
| CrossFire / SLI | Yes / Yes | Yes / Yes | Yes / - | Yes / - | - | - | - |
Each chipset will add select numbers of USB ports, the Ryzen processor also offers four native USB 3.1 ports. There is support for RAID 0/1/10 configurations both SATA and now NVME as well as overclocking support on the X470 and B450 chipset. B450 will also support enhanced XFR2. Obviously, the motherboard partners could add 3rd party chips to increase USB 3.0 and so on.
Source: El Chapuzas Informatico
