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dm111
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Registered: ‎02-15-2019
Location: US
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Message 1 of 4

P52 Thunderbolt ports refresh rate, 2 external 4k monitors

On the P52 specs, it says that it can drive 4 independent displays, and for the Thunderbolt ports, the max resolution is 5120X2880@30Hz. But what is the max resolution at 60Hz? Can I have the 4k laptop screen, plus two 4k external monitors individually connected to the two Thunderbolt ports, all running at 4k and 60Hz?

 

(when I say 4k, i mean 3840x2160)

 

Link to spec:

https://psref.lenovo.com/syspool/Sys/PDF/ThinkPad/ThinkPad%20P52/ThinkPad_P52_Platform_Specification...

 

For reference, here are the specs for the other video ports:

3840X2160@60Hz (DisplayPort via Mini DisplayPort cable)

4096x2160@60Hz (HDMI)

Note, I prefer to avoid the HDMI port if possible, due to issues from a P50 I'm currently using, no idea if they have been fixed or not in the P52.

Community SeniorMod
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Message 2 of 4

Re: P52 Thunderbolt ports refresh rate, 2 external 4k monitors

Hello,

 

A 3840×2180 UHD resolution at 60Hz with 8-bit color depth and 4:4:4 Chroma sampling uses 17.82Gbps, according to this data rate calculator.  The Thunderbolt 3 interface is 40Gbps.  So, in theory, you could be able to get two 4K displays at 60Hz attached.  However, I don't recall off the top of my head anyone who has done this, so you may have to experiment to see if/how well it actually works.

 

Regards,

 

Aryeh Goretsky

 



I am a volunteer and neither a Lenovo nor a Microsoft employee.

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abax2000
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Message 3 of 4

Re: P52 Thunderbolt ports refresh rate, 2 external 4k monitors

In such case, how is it possible to get (4) monitors running through a Thunderbolt 3 Workstation Dock, which is connected with P52 with a single thunderbolt connection?

 

P52, 8850H, P2000, W10pro 1809
dm111
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Registered: ‎02-15-2019
Location: US
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Message 4 of 4

Re: P52 Thunderbolt ports refresh rate, 2 external 4k monitors

Hi goretsky,

 

Thanks for the reply. I agree that it should work in theory. I also checked the Quadro P2000 graphics card spec, and it says 4 monitors at 4k 120hz, or at 5k 60hz, so no limitation there. So why would Lenovo only spec 5k 30hz (especially when they spec 4k 60hz on the other ports)? This concerns me that there may be some sort of limitation in the laptop architecture to the thunderbolt ports? 4k 60hz is a higher bandwidth than 5k 30hz. Or do they mean they can do 5k 30hz in addition to 4k 60hz? Hopefully somebody has done this and can confirm, I can't be the only one wanting to do it.

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