this post was submitted on 10 Dec 2023
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Motherboard provides more USB ports than B450? (lemmy.ml)
submitted 8 months ago by [email protected] to c/[email protected]
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cross-posted from: https://lemmy.ml/post/9114359

My motherboard provides 4x USB 3.2 Gen1 ports for rear I/O and another 2x USB 3.2 Gen1 ports for front I/O (through the header), but my chipset only supports 2x USB 3.2 Gen1 ports. Where is the support for the other ports coming from?

Motherboard Wikipedia
Motherboard rear I/O: 2x USB 2.0 ports, 4x USB 3.2 Gen1 ports, 2x USB 3.2 Gen2 portsMotherboard headers: 4x USB 2.0 ports, 2x USB 3.2 Gen1 ports Wikipedia B450 chipset: 6x USB 2.0 ports, 2x USB 3.2 Gen1 ports, 2x USB 3.2 Gen2 ports

The motherboard is an ASRock B450M Steel Legend

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[โ€“] [email protected] 2 points 8 months ago (1 children)

Ah, so the chipset uses a few PCIe lanes from the CPU for some USB controllers, and the other USB controllers use dedicated USB lanes coming from the CPU?

[โ€“] [email protected] 3 points 8 months ago

Right, the CPU has a number of standard I/O controllers onboard including USB. No PCIe lanes required for these IIRC. They live on the die itself, often adjacent to the PCIe controllers.