PCI Express: x12 slots?

Soldato
Joined
1 Apr 2014
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19,084
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Aberdeen
Can a PCI Express slot be split into x12 and x4?

On most consumer motherboards there in one PCIe x16 slot which can be split into two x8 slots. That's not a lot of use these days. Allegedly the new GPUs will be bottlenecked by a PCIe v4 x8 slot, but not a x16 slot. NVME cards run off x4 slots. So is it possible to split x16 into x12 and x4?
 
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