A single lane of DMI 4.0 has a speed of 16GT/s
https://en.wikipedia.org/wiki/Direct_Media_Interface
A single lane of PCIe 4.0 has a speed of 16GT/s
https://en.wikipedia.org/wiki/PCI_Express
Intel Z790 chipset is connected to the CPU through a DMI 4.0 x8 lanes (128GT/s)
How is it possible to have up to 20x PCIe 4.0 (320GT/s) from the chipset if the chipset only has a bandwidth of (128GT/s) from the CPU?
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All I know is speed -
https://i.imgur.com/DnLTTFL.png
Before anyone wants to point out that Optane is better for random read / write, do also show me 8 Tb of Optane storage.