B550M Hardware support for dual pci-e on wifi m.2

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   Hi 

I'm trying to use the Wifi M.2 slot with a google coral dual tpu, it seems to work but only with one tpu atm

Does this m.2 slot support dual pcie lanes?

According to the information from the google coral doco
"the M.2 Specification (section 5.1.2) declares E-key sockets provide two instances of PCIe x1, most manufacturers provide only one"

This has been asked already by someone else but in the wrong section of the forums

https://forum.asrock.com/forum_posts.asp?TID=26194&PID=106721&title=asrock-b550m-steel-legend-m-2-socket-key-e-lanes#106721

Full description for Google Coral is here: https://coral.ai/products/m2-accelerator-dual-edgetpu/

Cheers

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duindain Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 24 Oct 2023 Status: Offline Points: 50	Post Options Post Reply Quote duindain Report Post Thanks(0) Quote Reply Topic: B550M Hardware support for dual pci-e on wifi m.2 Posted: 24 Oct 2023 at 5:56am
	Hi I'm trying to use the Wifi M.2 slot with a google coral dual tpu, it seems to work but only with one tpu atm Does this m.2 slot support dual pcie lanes? According to the information from the google coral doco "the M.2 Specification (section 5.1.2) declares E-key sockets provide two instances of PCIe x1, most manufacturers provide only one" This has been asked already by someone else but in the wrong section of the forums https://forum.asrock.com/forum_posts.asp?TID=26194&PID=106721&title=asrock-b550m-steel-legend-m-2-socket-key-e-lanes#106721 Full description for Google Coral is here: https://coral.ai/products/m2-accelerator-dual-edgetpu/ Cheers

eccential Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 10 Oct 2022 Location: Nevada Status: Offline Points: 6530	Post Options Post Reply Quote eccential Report Post Thanks(0) Quote Reply Posted: 24 Oct 2023 at 6:34pm
	I don't get why they chose to make it E-key, since everyone should know most implementation of A/E slots only support a single lane of PCIe. Even adapters that let you put WiFi modules (A/E) onto NVMe slots (M) I see on Amazon say they only route one lane. They should've made it for M-key, in my opinion. Then again, I wonder if it would work as 2 units even on a typical M-key slot. If it's truly 2 independent units, wouldn't it require PCIe bifurcation support? If so, perhaps that explains why they picked E-key. It's to be a specialty equipment from the get go. On an unrelated note, I wonder how the Coral compares to the XDNA-based IPU built into AMD Phoenix APUs. I imagine they'll make AM5 desktop version of them at some point, hopefully.

duindain Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 24 Oct 2023 Status: Offline Points: 50	Post Options Post Reply Quote duindain Report Post Thanks(1) Quote Reply Posted: 25 Oct 2023 at 5:30am
	Someone in the community has made separate adapters that allow both units to work via pci-e or in a m.2 slot I think they don't require bifurcation to work though there is some added latency, I was going to buy one soon since it seems a forgone conclusion that the motherboard only has the one lane https://github.com/magic-blue-smoke/Dual-Edge-TPU-Adapter