this post was submitted on 30 May 2024
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The reason is flexibility, the board manufacturer can decide how many PCIe lanes to send where, how many USB ports there's going to be etc. Modern mainboards are a power delivery system and IO backplane.
this makes sense but can't it be done with integrated chipsets too?
Yeah but then you can't switch out the chipset without having a different CPU skew and probably also socket because changing IO without changing up pins doesn't sound like a good idea. People would barely notice the additional sockets with Intel but we don't want to take Intel as a benchmark there, do we.