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Question about TB3 lanes.
 

Question about TB3 lanes.  

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mr.ribeiro
(@mr-ribeiro)
Eminent Member
Joined: 2 years ago
 

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...

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itsage
(@itsage)
Famed Member Admin
Joined: 3 years ago
 

@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.

Best ultrabooks for eGPU use | eGPU enclosure buying guide


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mr.ribeiro
(@mr-ribeiro)
Eminent Member
Joined: 2 years ago
 

@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.

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itsage
(@itsage)
Famed Member Admin
Joined: 3 years ago
 

Unfortunately the Lenovo T480 has a x2 PCIe connection over Thunderbolt 3 port. Here’s one build with iGPU only configuration.

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mr.ribeiro
(@mr-ribeiro)
Eminent Member
Joined: 2 years ago
 

Will be this running bad in internal display? i want to use internal display for cause of the portability..

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itsage
(@itsage)
Famed Member Admin
Joined: 3 years ago
 

If you plan to use the eGPU to accelerate the internal display, avoid x2 PCIe Thunderbolt 3 systems.

Best ultrabooks for eGPU use | eGPU enclosure buying guide


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mr.ribeiro
(@mr-ribeiro)
Eminent Member
Joined: 2 years ago
 

Thx again, but in x2 lanes TB3 i'll have much data loss? for me play in 50 fps on ultra settings on internal display are good for me.

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Eddiexx
(@eddiexx)
Active Member
Joined: 12 months ago
 

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.

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itsage
(@itsage)
Famed Member Admin
Joined: 3 years ago
 

@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.

Best ultrabooks for eGPU use | eGPU enclosure buying guide


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Eddiexx
(@eddiexx)
Active Member
Joined: 12 months ago
 

Thank you, I rarely use Windows. This is great!

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