Dell USB 3.1 Gen 2 claimed to support 40GPS Thunderbolt 3
One Dell G5 15 laptop with i7-9750H and RTX-2060 I am looking at has the following claim;
"1x Thunderbolt™ 3 Port (USB 3.1 Gen 2 Type-C with Support for 40 Gbps Thunderbolt and Display Port)"
Is this something that can support an eGPU? I'm not concerned about power, wake-up, etc, just the ability to enable an eGPU for deep learning purposes.
Thunderbolt 3 supports one of the following (depends on what is connected):
1) up to 8 lanes DisplayPort tunnelling + PCIe tunnelling up to 22 Gbps or whatever is left over of the 40 Gbps after DisplayPort takes its portion.
2) up to 2 lanes of DisplayPort + USB 3.1 Gen 2 10 Gbps + USB 2.0 480 Mb/s
3) up to 4 lanes of DisplayPort + USB 2.0 480 Mb/s
DisplayPort 1.2 for Alpine Ridge
DisplayPort 1.4 for Titan Ridge
#2 and #3 are just USB-C with DisplayPort alt mode. It can't be called Thunderbolt if it doesn't support #1.
eGPUs connect a GPU via Thunderbolt PCIe tunnelling to the computer. An eGPU should be usable with any computer that has a Thunderbolt port but some PC manufactures won't support an eGPU with some laptops/motherboards (laziness? or they don't want to deal with the support issues because of crappy drivers from Microsoft, AMD, or Nvidia that they can't control?).
Very helpful, thanks @joevt
Is there any way I can tell (or find out) if this Dell is a #1, #2, or #3?
What itsage said. I said it can't be called Thunderbolt unless it does #1. They call it Thunderbolt. Therefore the answer is #1.
My concern is that in the main text of the overview, after "1 x Thunderbolt" they append the qualifier "(USB 3.1 Gen 2 Type-C with Support for 40 Gbps Thunderbolt and Display Port)". Am I being too cautious?
It does #1 (Thunderbolt 3), so it means it also does #2 (USB 3.1 Gen 2) and #3 (DisplayPort).
I guess they start with USB 3.1 Gen 2 because USB is the main mode for a USB-C port. Thunderbolt and DisplayPort are alt modes of USB-C. The USB-C port and the USB-C device negotiate what mode they are going to use. You can look up USB, USB-C, DisplayPort, and Thunderbolt at wikipedia.org