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Motherboard provides more USB ports than B450? (lemmy.ml)
submitted 11 months ago by glibg10b@lemmy.ml to c/buildapc@lemmy.world
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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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[-] glibg10b@lemmy.ml 2 points 11 months ago

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?

[-] Septimaeus@infosec.pub 3 points 11 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.

this post was submitted on 10 Dec 2023
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