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From:
https://www.theverge.com/2019/6/10/18660213/amd-ryzen-9-3950x-16-core-gaming-cpu-processor-e3-2019
"Perhaps most impressively, none of these new Ryzen processors — not even the 16-core — require a new size and shape of chip. They’ll all fit into almost any existing AM4 motherboard, thanks to AMD’s painstaking work designing a 12-layer substrate to route each of the new, smaller 7nm process circuits to the existing AM4 pins that go into the socket on your board.
One of the routing layers devised to maintain AM4 compatibility
And AMD says it plans to keep offering that kind of backward compatibility through 2020 and for the foreseeable future, instead of making you buy a new board alongside your next CPU upgrade. “It will really take a major inflection point in the platform technology for us to move off of socket AM4,” says AMD’s David McAfee, adding that it would probably take a major change in how memory or PCI expansion slots work before AMD needs to move to a new socket. AMD’s new X570 platform already supports PCIe 4.0, so that’s one potential bullet dodged."
https://www.theverge.com/2019/6/10/18660213/amd-ryzen-9-3950x-16-core-gaming-cpu-processor-e3-2019
"Perhaps most impressively, none of these new Ryzen processors — not even the 16-core — require a new size and shape of chip. They’ll all fit into almost any existing AM4 motherboard, thanks to AMD’s painstaking work designing a 12-layer substrate to route each of the new, smaller 7nm process circuits to the existing AM4 pins that go into the socket on your board.
:format(webp):no_upscale()/cdn.vox-cdn.com/uploads/chorus_asset/file/16331458/amd_ryzen_3000_layer_substrate_routing.jpg)
One of the routing layers devised to maintain AM4 compatibility
And AMD says it plans to keep offering that kind of backward compatibility through 2020 and for the foreseeable future, instead of making you buy a new board alongside your next CPU upgrade. “It will really take a major inflection point in the platform technology for us to move off of socket AM4,” says AMD’s David McAfee, adding that it would probably take a major change in how memory or PCI expansion slots work before AMD needs to move to a new socket. AMD’s new X570 platform already supports PCIe 4.0, so that’s one potential bullet dodged."