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ductsurprise | 6 months ago

Friendly FYI: Some M.2 slots offer up to 4 PCIe lanes.

Though, it looks like on the lite version mentioned here, there is but one PCIe lave available on the slot.

Edit: Adding the size is likely the reason and full regular PCIe is not there. The PCIe card would likely be as big as the board it self. :)

discuss

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adolph|6 months ago

Definitely don't assume M.2 == PCIe lanes tho.

The number of PCIe lanes available is typically defined by the CPU in an SoC context or the lowest common between the CPU and chipset in a traditional motherboard architecture. M.2 defines a physical connector that may connect to different things depended on its intended use. An example is the difference between those intended for SATA or NVMe. Additionally it is common for lower bandwidth peripherals like wifi cards to use an M.2 connector although only be wired into a subset of the board's possible PCIe lanes.

https://www.crucial.com/articles/about-ssd/m2-with-pcie-or-s...

duskwuff|6 months ago

> Additionally it is common for lower bandwidth peripherals like wifi cards to use an M.2 connector...

And some of those don't use PCIe at all - the connector can also carry USB signals.