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shorter is obviously better, but from what I've read 30 cm PCIe riser cables work, and there are 50 cm examples.

We have problems with signal integrity on cheap risers and ribbon cables.

Huh, that's longer than I thought, thanks.

As long as the insulation is good, in theory everything is possible.

You could build your own super long PCI Extender Cable, using superconductors...

Resistive losses are only a part of the total loss on a transmission line.