Can I use gen5 8x M.2 PLX switch card on gen4 host to use two gen5 NVME at full speed?

@Eyoldaith asked about it the other way round in the Neverending Story.

It would indeed be good to verify with customer support, cause there’s a lot of misconception around these. There are also “dumb” switches out there that don’t take the generation into account and just switch lanes.

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