Question about TB3 lanes.
This is my first topic in this forum. Then please moderator move this topic to correct place..
Now the question. Supposing that i buy an laptop with TB3 port and dGPU, the PCIE lanes is 4 divided to 2 components, 2 lanes to dGPU and 2 lanes to TB3. Then if i buy an laptop without dGPU the PCIE lanes is directioned to only 1 component that is TB3 port, then i'll have an TB3 with 4 lanes? veridic or not? thanks a lot...
@mr-ribeiro Welcome aboard. There's no set rules on how manufacturers assign PCIe lanes for Thunderbolt 3 port on their laptops. In my experience Apple has prioritized the Thunderbolt ports in their Macs so it's not really a concern. PC laptops with a single Thunderbolt 3 port and dGPU are likely to have undesirable Thunderbolt configuration. There are exception such as Alienware laptops. Let us know which laptops you're considering and figure it out.
@itsage thx for the answer. I'm thinking of buying a Lenovo T480 w / o dGPU, I read in the reddit topic that the T470 with dGPU has a x2 clues in TB3 but I do not know about T480 I do not want a dGPU because I'm going to use eGPU because of the possibility of use any video card.
Unfortunately the Lenovo T480 has a x2 PCIe connection over Thunderbolt 3 port. Here's one build with iGPU only configuration.
If you plan to use the eGPU to accelerate the internal display, avoid x2 PCIe Thunderbolt 3 systems.
I have a MBPnTB with only 2 TB3 ports. If I use one for eGPU, is the other one still useable? I would like to use the second TB3 port for my mouse.
@mr-ribeiro The performance loss is significant on x2 PCIe Thunderbolt 3 connection when you accelerate internal display with eGPU. You have to give it a try and see whether you're happy with the performance.
@eddiexx Are you using macOS or Windows? In macOS, the second TB3 should remain working with a connected eGPU. In Windows, AMD eGPU may cause issues but you can try connecting the mouse prior to boot.