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They're definitely considering both directions for the total bandwidth number.

But I don't think that's what's happening with the gigatransfers. When they launched 5.0, they were clearly counting one differential pair of pins: "Delivers 32 GT/s raw bit rate and up to 128 GB/s via x16 configuration"

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I am pretty sure that 5.0 128GB/sec figure is also total bidirectional bandwidth with each direction being approximately 64GB/sec

Yes, it is.

But my point is, even though they were already doing that, they were claiming 32GT/s last generation. But it's 64GT/s now. I don't think that's counting more pins, I think they're saying that each transfer is two transfers.

I think 128GB/s should be single direction, as 32GB/s was single direction for gen 4.

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