F5F Stay Refreshed Hardware Desktop Learn how to connect a dedicated GPU output via DP Alt Mode from your motherboard's USB-C port.

Learn how to connect a dedicated GPU output via DP Alt Mode from your motherboard's USB-C port.

Learn how to connect a dedicated GPU output via DP Alt Mode from your motherboard's USB-C port.

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Telux
Junior Member
40
01-06-2023, 02:35 AM
#1
You're curious about using the ASUS X870i Strix Mobo with DP Alt Mode support. It's possible to run a 4070TI signal through the USB-C port on the motherboard for monitoring. You'll need to adjust certain settings, though—this might add some latency. Just follow your curiosity and proceed carefully.
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Telux
01-06-2023, 02:35 AM #1

You're curious about using the ASUS X870i Strix Mobo with DP Alt Mode support. It's possible to run a 4070TI signal through the USB-C port on the motherboard for monitoring. You'll need to adjust certain settings, though—this might add some latency. Just follow your curiosity and proceed carefully.

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_NinjaSam_
Member
170
01-06-2023, 04:06 AM
#2
The mobile device with DPI Alt support on its USB-C connection allows it to transmit the CPU's iGPU video output. Some suggest you can send the video from the dGPU's DP port to the mobile's DP port and then route it via USB-C using DP-ALT mode. I haven't found a live demo of this yet.
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_NinjaSam_
01-06-2023, 04:06 AM #2

The mobile device with DPI Alt support on its USB-C connection allows it to transmit the CPU's iGPU video output. Some suggest you can send the video from the dGPU's DP port to the mobile's DP port and then route it via USB-C using DP-ALT mode. I haven't found a live demo of this yet.

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Eulfy
Member
122
01-10-2023, 12:57 AM
#3
Some motherboards include a DP *in* port specifically for this use case, which differs from a DP *out* port. Connecting an external DP to a USB-C signal works through supported technology, whether via Thunderbolt chipsets or other USB 3.x solutions (I've tried both). If your CPU features a graphics processing unit, you can route the GPU's rendered frames through the iGPU to show on DP-alt mode—similar to laptops with dedicated GPUs. Without an iGPU or a DP port, no further action is possible. Using this setup incurs a cost in PCIe bandwidth and latency (the time it takes for frames to travel back from the GPU), though this is typically minimal, especially on gaming laptops.
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Eulfy
01-10-2023, 12:57 AM #3

Some motherboards include a DP *in* port specifically for this use case, which differs from a DP *out* port. Connecting an external DP to a USB-C signal works through supported technology, whether via Thunderbolt chipsets or other USB 3.x solutions (I've tried both). If your CPU features a graphics processing unit, you can route the GPU's rendered frames through the iGPU to show on DP-alt mode—similar to laptops with dedicated GPUs. Without an iGPU or a DP port, no further action is possible. Using this setup incurs a cost in PCIe bandwidth and latency (the time it takes for frames to travel back from the GPU), though this is typically minimal, especially on gaming laptops.

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Emuril23
Member
54
01-17-2023, 08:45 PM
#4
Another question was raised about configuring the pipeline from PCIE to the iGPU.
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Emuril23
01-17-2023, 08:45 PM #4

Another question was raised about configuring the pipeline from PCIE to the iGPU.

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Swagtart
Junior Member
5
01-18-2023, 05:33 AM
#5
It's like being around six years old, but I think the idea makes sense from this video (without the sketchy unsigned drivers for a mining card). I feel like Windows just manages things better these days. You just have to say which GPU you want it to use.
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Swagtart
01-18-2023, 05:33 AM #5

It's like being around six years old, but I think the idea makes sense from this video (without the sketchy unsigned drivers for a mining card). I feel like Windows just manages things better these days. You just have to say which GPU you want it to use.

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fuhqing
Member
180
01-18-2023, 12:54 PM
#6
They usually notice slow performance when using the built-in HDMI connection without realizing it. My friend experienced this issue with a brand-new machine featuring an Asus board and Windows 11.
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fuhqing
01-18-2023, 12:54 PM #6

They usually notice slow performance when using the built-in HDMI connection without realizing it. My friend experienced this issue with a brand-new machine featuring an Asus board and Windows 11.

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DIDIx13
Member
90
01-23-2023, 02:19 AM
#7
They didn't instruct Windows to use the actual GPU, which caused Windows to select the GPU connected to the main display.
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DIDIx13
01-23-2023, 02:19 AM #7

They didn't instruct Windows to use the actual GPU, which caused Windows to select the GPU connected to the main display.

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banane45
Junior Member
29
01-23-2023, 10:06 AM
#8
You'd need to configure the system settings to prioritize the dedicated GPU, as most laptops rely on built-in features for performance optimization.
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banane45
01-23-2023, 10:06 AM #8

You'd need to configure the system settings to prioritize the dedicated GPU, as most laptops rely on built-in features for performance optimization.

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Fireano
Junior Member
45
02-13-2023, 08:37 PM
#9
Referring to the settings displayed in the video...? It's possible Microsoft has shifted away from them, though they might still exist. You're likely thinking of a "mux switch" used as a workaround so both the integrated graphics and dedicated GPU could control the same display panel—eliminating latency or frame rate issues when sending frames back to the iGPU, while also preventing the dGPU from handling basic tasks. This approach wasn't widely adopted outside top-tier gaming laptops.
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Fireano
02-13-2023, 08:37 PM #9

Referring to the settings displayed in the video...? It's possible Microsoft has shifted away from them, though they might still exist. You're likely thinking of a "mux switch" used as a workaround so both the integrated graphics and dedicated GPU could control the same display panel—eliminating latency or frame rate issues when sending frames back to the iGPU, while also preventing the dGPU from handling basic tasks. This approach wasn't widely adopted outside top-tier gaming laptops.