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3 Posts

01-14-2017

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  • Message 21 of 24

Re: Thinkpad P70 + dock and 2 * 4K external monitors @ 60 Hz

2017-01-14, 4:05 AM

To add onto my previous post slightly, I ran some calculations and I get roughly 22 Gbps running the three 4k monitors (2 at 29hz and 1 at 30hz) vs. Startech's claimed DP 1.2 bandwidth cap at 21.6 Gbps.

 

Two 4k monitors, both at 60 hz come out to roughly 31 Gbps so I believe that no, you can't run two 4k monitors at 60 hz through the DP 1.2 ports.  BUT, I don't know if the native laptop monitor and one 4k 60hz monitor can run at the same time as I don't know that total bandwidth available.  One user claims to be doing so but are they truly running at 60 hz or 30hz.  Easily tested.  I also don't know if it can be done through the thunderbolt connector without more research.  I do not think it is possible to run one 4k 60hz on the DP 1.2 and one 4k 60hz on the HDMI as my initial trials would not let me do that.

 

Per Wikipedia: "Intel's Thunderbolt 3 controller (codenamed Alpine Ridge) doubles the bandwidth to 40 Gbit/s (5 GB/s), halves power consumption, and simultaneously drives two external 4K displays at 60 Hz (or a single external 4K display at 120 Hz) instead of just the single display previous controllers can drive. The new controller supports PCIe 3.0 and other protocols, including HDMI 2.0, and DisplayPort 1.2 (allowing for 4k resolutions at 60 Hz)"

 

So you should be able to run two 4k monitors set at 60 hz with Monitors that have native thunderbolt 3 connectors.  Unfortunately, I can't find a reference through Nvidia that confirms the graphics card is capable of that so it has to be confirmed through Lenovo or by testing.  Unfortunately, the P70 dock I have does not have thunderbolt ports so it would have to be connected to the laptop directly.

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1 Posts

10-04-2017

IT

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  • Message 22 of 24

Re: Thinkpad P70 + dock and 2 * 4K external monitors @ 60 Hz

2018-01-04, 18:26 PM

Hi, did you managed to make running your thinkpad with Dell tb15?

 

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3 Posts

01-14-2017

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  • Message 23 of 24

Re: Thinkpad P70 + dock and 2 * 4K external monitors @ 60 Hz

2018-01-04, 21:52 PM

I'm using a model 40A50230US  dock for my laptop.

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1 Posts

01-15-2018

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  • Message 24 of 24

Re: Thinkpad P70 + dock and 2 * 4K external monitors @ 60 Hz

2018-01-15, 17:49 PM

I've had a similar experience. I have a P50 with an upgraded video card, with the intention of running 2, 4K monitors. Turns out the additional video card can only power the laptop screen. I put up with slightly lagging graphics for about two months and then began complaining. 30 days is the return policy and despite my 3 year extended warranty, Lenovo has been of no help. And the lagging has only worsened. It's like the computer has a disease. 

 

I should have tried to return the computer within 30 days, but also, Lenovo should be willing to support me after having purchased a $3k + laptop. I know for a fact my company would happily replace any product that did not live up to it's expectations if it were within our 3 year warranty. Absolutely ridiculous. 

 

Lesson learned: dont buy a Lenovo. If you've already done so, return it ASAP. The customer service representatives I dealt with were not only outrageaously rude, but incredibly uneducated in regards to how they might be able to help. If you enjoy long customer service calls that include unwarranted attitude and end with nothing more than what you started with; in my case a $3k + piece of **insert words that I probably shouldn't write here**, then buy a Lenovo. 

 

 

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