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Comment on Can the M.2 slot in my Dell Optiplex 3070 micro be used for ethernet? I don’t

The key doesn’t correspond to capability. It’s about the connector’s physical shape. i.e. which side is the lil notch on. B has a notch on the right, M on the left. B & M have a notch on both sides and therefore fits into either connector, but it is limited to PCIex2/SATA speed (i’d guess this won’t matter to you as pciex2 is around 16gbps). It also doesn’t mean the length would fit, that’ll be a number like 2230, 2280 etc.

You’d have to check the manual for the motherboard to see if it specifies, but if it’s labelled m.2 PCIe it should work I think. If it only said SATA then it would not work.

You can try dmidecode --type slot on Linux, it should list them as available and presumably specify the type to be PCI express.

I think ultimately you’ll only know when you try, but these may give you some confidence.

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kkj@lemmy.dbzer0.com ⁨1⁩ ⁨day⁩ ago
Huh, TIL that B-keyed slots can have any PCIe at all. I thought it meant SATA-only.

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djdarren@piefed.social ⁨2⁩ ⁨days⁩ ago
This is the output of dmidecode

Handle 0x0026, DMI type 9, 17 bytes System Slot Information Designation: SLOT1_M.2 Type: x4 M.2 Socket 3 Current Usage: Available Length: Long Characteristics: 3.3 V is provided PME signal is supported Bus Address: 0000:ff:1f.7

Handle 0x0027, DMI type 9, 17 bytes System Slot Information Designation: SLOT2_M.2 Type: x1 M.2 Socket 1-SD Current Usage: In Use Length: Short Characteristics: 3.3 V is provided PME signal is supported Bus Address: 0000:ff:00.0

I’m guessing the top one is the M.2 in question, on account of it saying “Available”. And from what I understand having searched for some of the info on that, it should work, assuming the firmware allows for it.

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- Wildmimic@anarchist.nexus ⁨2⁩ ⁨days⁩ ago
  The slot that is currently in use is the slower one since it’s only Type: x1. Depending on what you use the slot currently (such as an M.2 drive), you might wanna switch slots so you can take advantage of the M.2 speed; the x1 slot is completely adequate for 1gbps ethernet if you don’t need more. Both slots are otherwise functionally the same, but make sure to look up in your mainboard documentation if there’s any limitation if you use both slots or a specific hardware configuration (mine deactivated the second M.2 slot after changing from an 2600x to an 5950x for example)
  
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- toebert@piefed.social ⁨2⁩ ⁨days⁩ ago
  I believe the fact that it comes up as a “slot” is positive. SATA m.2 connectors don’t show up under slots, they come under “connector"s with type SATA.
  
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