Yes 40 Gigibits per second max
but not from just the PCIE which as you so correctly say is 4 x 8G
However the Thunderbolt3 using the USB 3.1 type C connection (4 data lanes) allows you to aggregate the 4 10Gbps - 40 Gbps with other protocols
So as on here
In the Thunderbolt mode, Thunderbolt 3 port has the ability to
support at least one or two (4 lane) DisplayPort interface(s) and up to 4 lanes of PCI Express Gen 3
And if you cannot be bothered reading that many pages the short explanation is
Four lanes of PCI Express Gen 3 operate at (4 x 8 Gbps) 32 Gbps roughly.
Thunderbolt 3 uses PCIe x4 gen 3 data rate with 128kB header sizes.
For a single Thunderbolt chip with two ports, the x4 PCIe interface data rate is shared across the ports.
Two links of (4 lane) DisplayPort 1.2 consume 2x (4 x 5.4 Gbps) or 43.2 Gbps.
For both of these numbers, the underlying protocol uses some data to provide encoding overhead which is not carried over the Thunderbolt 3 link reducing the consumed bandwidth by roughly 20 percent (DisplayPort) or 1.5 percent (PCI Express Gen 3).
But regardless, adding both together gets you above 40 Gbps.
sorry for the late reply, and thank you for your time in answering my question , i took some time reading and understanding that document
your explanation is great, smooth answer, thanks a lot , the document was very helpful
According to the document:
# Four Lanes of PCI Express Gen 3 can throughput up to 32 Gbit/
# 8 lanes of DisplayPort 1.2 (HBR2 and MST) can throughput up to 43.2 Gbit/s
so thunderbolt 3 will borrow 8 Gbit from DisplayPort 1.2 lanes to complete the maximum speed of Thunderbolt 3 which is 40 Gbit/s is that correct understanding ?
another thing i would like you to explain it to me if you don't mind, thunderbolt 3 usb-c can output in theory 75.2Gbit/s ( 32 Gbit/s & 43.2 Gbit/s ) !! but from what i understand, thunderbolt 3 protocol cannot handle that speed it will only handle 40Gbit/s as maximum speed is that a correct understanding ?
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