Amazon.com: Micro Center AMD Ryzen 5 4500 6-Core, 12-Thread Unlocked Desktop Processor Bundle with ASUS Prime B450M-A II AMD AM4 (Ryzen 5000, 3rd/2nd/1st Gen Ryzen Micro ATX Motherboard : Electronics
Ryzen 4000 and X670 to launch in late 2020, Socket AM5 to debut with Ryzen 5000 - NotebookCheck.net News
AMD Ryzen 4000 desktop APUs will be here in Q3 2020 | Ars Technica
AMD's Ryzen 4000 and Q3 2020-bound desktop processors confirmed to support the AM4 socket and B450 chipset - NotebookCheck.net News
Socket AM4 - Wikipedia
Ryzen 4000 Zen 3 Desktop CPU Compatibility Only With X570 & B550, not 400 or lower
AMD Ryzen 4000 Zen 3 will be compatible with Socket AM4, but it is end of the road for X470, B450, and below motherboard owners - NotebookCheck.net News
MSI are ready to support Ryzen 5000/4000 series processors for AMD 500, 400, and 300-
AMD Ryzen 4000 desktop CPUs will only work on 500-series motherboards | Windows Central