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post #7 of (permalink) Old 11-03-2017, 05:13 AM
pantsaregood
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Also please be aware that "the PCH provides 24 lanes" is a bit deceptive, as the PCH is connected to the CPU with a DMI 3.0 link, which has the same bandwidth as a PCI-E 3.0 x4 link.

What this means is that even though each device connected to the PCH can communicate to the PCH at PCI-E x4 speeds, the PCH can only communicate to the CPU at PCI-E x4.

Bluntly, two nVME SSDs going through the PCH would be using a single PCI-E x4 link to try to move the bandwidth a PCI-E x8 link would carry.
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