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BobOfAllTrades
What's DOS?
Posts: 2
Registered: ‎11-22-2017
Location: US
Views: 3,814
Message 1 of 7

Lenovo 720s-14ikb 81bd ThunderBolt 3 use 2 or 3 pci-e lanes?

Hello, my name is Bob and i'm a content creator who covered the lenovo 720s-14ikb 81bd on my channel.  All I need to know now is how many pci-e lanes the TB3 post runs on.

 

Please advise,

Bob

BobOfAllTrades
What's DOS?
Posts: 2
Registered: ‎11-22-2017
Location: US
Views: 3,682
Message 2 of 7

Re: Lenovo 720s-14ikb 81bd ThunderBolt 3 use 2 or 3 pci-e lanes?

Sorry I meant "2 or 4" pci-e lanes.  Long day yesterday Smiley Happy

 

So far we have this thread https://www.reddit.com/r/thinkpad/comments/5ykwge/to_all_owners_of_thinkpads_with_thunderbolt_3/

 

But this particular unit as of now has not been added to the list.

appleproduct
Fanfold Paper
Posts: 3
Registered: ‎12-08-2017
Location: US
Views: 3,509
Message 3 of 7

Re: Lenovo 720s-14ikb 81bd ThunderBolt 3 use 2 or 3 pci-e lanes?

I just received this model yesterday, and I'm trying to figure out just that.  Before purchasing I asked a rep how many PCIe lanes could go over TB3, and he claimed 4.  I downloaded HWiNFO64 and here's a screenshot: Screenshot (4).png

I'm not entirely sure what all this means, but I think since I have nothing hooked up to my TB3 port at the moment that the highlighted port is the one in question (hopefully I'm wrong).

 

Edit: New photo, this time w/ a device attached.  Again, I'm seeing both x2 and x4 on that so I'm not sure what's what.

demiss
Paper Tape
Posts: 2
Registered: ‎05-03-2018
Location: US
Views: 2,286
Message 4 of 7

Re: Lenovo 720s-14ikb 81bd ThunderBolt 3 use 2 or 3 pci-e lanes?

Hi, laptop with U processor usually has x2 TB3, and the screenshot above shows it. You have to look at the first level child entry under the TB3 pcie root entry which is PCI Express x2 Bus #1, so it's x2.

appleproduct
Fanfold Paper
Posts: 3
Registered: ‎12-08-2017
Location: US
Views: 2,276
Message 5 of 7

Re: Lenovo 720s-14ikb 81bd ThunderBolt 3 use 2 or 3 pci-e lanes?

Ah, thanks for the heads up.  Too bad the Lenovo rep I chatted with before buying my computer EXPLICITLY told me it was a 4-lane interface.

appleproduct
Fanfold Paper
Posts: 3
Registered: ‎12-08-2017
Location: US
Views: 2,272
Message 6 of 7

Re: Lenovo 720s-14ikb 81bd ThunderBolt 3 use 2 or 3 pci-e lanes?

Screenshot_20171125-131553.png

Pretty annoying, I was hoping on setting up an eGPU sometime this year.

demiss
Paper Tape
Posts: 2
Registered: ‎05-03-2018
Location: US
Views: 2,263
Message 7 of 7

Re: Lenovo 720s-14ikb 81bd ThunderBolt 3 use 2 or 3 pci-e lanes?

You will be fine with x2 as long as you use external monitor.

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