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Multimonitor setup using eGPU  

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(@dennis_sorokin)
New Member
Joined: 2 weeks ago
 

Hello.

 

I am trying to find out the best way to connect 3 external monitors to laptop. Two monitors are 2K (2560x1440) and one is 4K. 

2K monitors support 144 Hz refresh rate (LG 32gk850f), 4K monitor going to be 60Hz.

 

Now it is:

1. Laptop with 3 video out, usually it is hdmi, DP (or mini DP) and thunderbolt or ubs-c (DP mode).

2. Laptop with TB3 + eGPU. To connect laptop to eGPU and 3 monitors to videocard output.

 

the first one is described by laptop manufacter, acer for example, triton 500 model. 

the second ... all i can find is success story about connect 3 ext monitors , which were FullHD. 

But i need 100Hz at least for both 2K and 60hz for 4K.

Is it possible using egpu ? 

Who is the "owner" of refresh rate - the egpu video card or laptop? 🙂

Do i need laptop with TB3 port connected to 4x?

... and so on.

 

If someone tells me what to look for or share links - I will be very grateful.

Thank you!

 

PS: UPD: OS - Windows

  

This topic was modified 2 weeks ago

Pending: Add my system information and expected eGPU configuration to my signature to give context to my posts


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joevt
(@joevt)
Noble Member
Joined: 2 years ago
 

The GPU and its drivers control the resolution and framerate of a display that is connected to the GPU. The drivers get the list of resolutions/timings from the display. You can use a utility like CRU to add other timings but they need to be within the range supported by the display.

The laptop may have one or two GPUs, one integrated in the CPU - called iGPU (usually Intel graphics), and another discrete GPU (call dGPU where discrete means separate from the CPU) this is usually AMD or Nvidia graphics - probably a mobile GPU. An eGPU (usually AMD or Nvidia) will use a more powerful desktop GPU.

You can connect a display to the iGPU, dGPU, or eGPU. For a Mac, the external ports are always connected to dGPU - the iGPU is used for the laptop display when no other displays are connected. PC laptops might have a similar automatic switch.

The laptop display is always connected to iGPU or dGPU. You can connect all the external displays to the eGPU. You don't need a TB3 port connected to 4 lanes of PCIe. Two fewer lanes won't decrease performance by much (unless you need to transfer a lot of data - like if you were using an eGPU to render frames to the laptop display). But there are enough laptops with 4 lanes that there is no reason to choose one with 2 lanes.

Thunderbolt doesn't do well for high fps gaming. It works better for lower FPS higher resolution but I guess it depends on the game.

Mac mini (2018), Mac Pro (Early 2008), MacBook Pro (Retina, 15-inch, Mid 2015), GA-Z170X-Gaming 7, Sapphire Pulse Radeon RX 580 8GB GDDR5, Sonnet Echo Express III-D, Trebleet Thunderbolt 3 to NVMe M.2 case


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