PCI
PCIe
https://en.wikipedia.org/wiki/PCI_Express#History_and_revisions
Per lane:
Version 1.0a: 2.5 GT/s is 2.5 Gbps on the encoded serial link. This corresponds to 2.0 Gbps of pre-coded data or 250 MB/s
Version 2.x : 5 GT/s = 500 MB/s
Version 3.x : 8 GT/s ~= 1 GB/s | upgraded the encoding scheme to 128b/130b from the previous 8b/10b encoding
Version 4.0 : 16 GT/s ~= 2 GB/s
split: BIOS - PCIe Bifurcation
Check
Powershell: https://superuser.com/questions/1732084/is-there-a-way-to-identify-the-pcie-speed-for-a-device-using-powershell-win10
devmgmt.msc : Properties - Details
Thunderbolt
https://en.wikipedia.org/wiki/Thunderbolt_(interface)
Superseded: IEEE 1394 (FireWire) / ExpressCard
Connector: v1/v2 - Mini-DP ; v3/v4 - USB-C
v3/v4: 40 Gbit/s (5 GB/s) bidirectional
Thunderbolt 3: 4× PCI Express 3.0, DisplayPort 1.2, USB 3.1 Gen 2
Thunderbolt 4: 4× PCI Express 3.0, DisplayPort 2.0, USB4
USB4 compatible with Thunderbolt 3, and backwards compatible with USB 3.2 and USB 2.0
Chip
Intel 6000 Series: https://www.thunderbolttechnology.net/sites/default/files/18-241_ThunderboltController_Brief_HI.pdf
JHL6340: 4 lanes
Peripherial Confiuration: 1
Intel 7000 Series: https://www.thunderbolttechnology.net/sites/default/files/18-241_Thunder7000Controller_Brief_FIN_HI.pdf
JHL7440: 2 Ports, Downstream x4 lanes
Peripherial Confiuration: 2 Tunneled, 1 dedicated DP output
DisplayPort
4 lanes: https://en.wikipedia.org/wiki/DisplayPort#Specifications
Thunderbolt 3 interface which implements up to 8 lanes of DisplayPort
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