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Yes, this. Infiniband has scaled up significantly since then as well. I believe you can do 4x25 (100Gb) today.

Having this background knowledge gives you a much better idea of why the interconnects is going to be such a big problem going forward.... When I was working with QDR IB 5 years ago, it didn't matter if they had faster cards - the PCI bus at the time couldn't support anything faster. So you were literally riding the edge of the I/O capability all the way through the stack.




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