MCIO to U.2 Cable = bottleneck?

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fatherboard

Member
Jun 15, 2025
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MCIO PCIe 5 -> MCIO x8 74 Pin to 2 X SFF-8639 U.2 Cable -> U.2 PCIe 5

It would be quite a remarkable stupidity to buy a PCIe 5 motherboard and a PCIe 5 U.2 and slow them down with a PCIe 4 cable, if indeed these cables come in PCIe versions.

This one was mentioned earlier, not sure about the PCIe version.
and Supermicro Internal Cable MCIO x8 to 2x SFF-8639 U.2+ Power Cable 40cm (CBL-MCIO-1240U2Y-E),
and this one also doesn't mention it.

Do these cable come also in PCIe versions? How do I know the cable is also PCIe 5?
 

i386

Well-Known Member
Mar 18, 2016
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Germany
._.

No. These cables are passive, they don't have any electronics that modify the signal or rate in any way.