F5F Stay Refreshed Hardware Desktop Display output from discrete graphics card via motherboard connection

Display output from discrete graphics card via motherboard connection

Display output from discrete graphics card via motherboard connection

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OkKid
Member
61
11-22-2021, 09:48 PM
#1
I had an opportunity to compare a current AMD IGPU with a solid discrete card. My son uses an RTX 3060 Ti on a Ryzen 5 5600G system. We asked him to run a moderately demanding game with each GPU in turn. We were both impressed by the lack of noticeable difference between the two when switching ports, even at ultra settings (without checking FPS). When we removed the 3060 Ti card, the frame rate dropped significantly. Later, it became clear that the discrete card was also using the motherboard's output port. Is this the expected behavior?
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OkKid
11-22-2021, 09:48 PM #1

I had an opportunity to compare a current AMD IGPU with a solid discrete card. My son uses an RTX 3060 Ti on a Ryzen 5 5600G system. We asked him to run a moderately demanding game with each GPU in turn. We were both impressed by the lack of noticeable difference between the two when switching ports, even at ultra settings (without checking FPS). When we removed the 3060 Ti card, the frame rate dropped significantly. Later, it became clear that the discrete card was also using the motherboard's output port. Is this the expected behavior?

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Matthieu_p
Member
217
11-23-2021, 03:39 AM
#2
Games will always opt for the most suitable GPU, regardless of the connected device, though some titles offer a choice to pick a specific card. Alternatively, you can utilize Windows graphics settings to customize each application separately.
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Matthieu_p
11-23-2021, 03:39 AM #2

Games will always opt for the most suitable GPU, regardless of the connected device, though some titles offer a choice to pick a specific card. Alternatively, you can utilize Windows graphics settings to customize each application separately.

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rhubarb11
Member
55
11-24-2021, 08:41 PM
#3
It was interesting to see the card's results displayed via the motherboard's output port. Now I understand.
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rhubarb11
11-24-2021, 08:41 PM #3

It was interesting to see the card's results displayed via the motherboard's output port. Now I understand.

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Maffin_
Member
181
12-05-2021, 07:37 PM
#4
The quiet GPU isn't connected through the motherboard ports.
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Maffin_
12-05-2021, 07:37 PM #4

The quiet GPU isn't connected through the motherboard ports.

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Brentjuh
Member
55
12-06-2021, 03:53 AM
#5
Then how does simply having the card affect performance so greatly when it's connected to the motherboard port? As I mentioned earlier, we didn't verify the frame rate, but it likely looked something like this:
- At least 50 frames per second with the 3060 Ti in the slot, whether the monitor is linked via the card's HDMI port or the motherboard's port. This was before installing the IGPU driver.
- Possibly around 10 fps, or even less, when the card was removed and only the generic Windows driver was used.
- Around 20 to 25 fps (rough estimate) once the IGP driver was installed.
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Brentjuh
12-06-2021, 03:53 AM #5

Then how does simply having the card affect performance so greatly when it's connected to the motherboard port? As I mentioned earlier, we didn't verify the frame rate, but it likely looked something like this:
- At least 50 frames per second with the 3060 Ti in the slot, whether the monitor is linked via the card's HDMI port or the motherboard's port. This was before installing the IGPU driver.
- Possibly around 10 fps, or even less, when the card was removed and only the generic Windows driver was used.
- Around 20 to 25 fps (rough estimate) once the IGP driver was installed.

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Mastera616
Member
163
12-06-2021, 11:35 AM
#6
Based on my observations, it seems the specialized GPU could be transmitting video data to the integrated graphics unit, which then forwards it to the screen. There could be issues such as delays or inconsistent frame rates, but it might function properly. My motherboard supports multiple monitors with iGPU, and linking two monitors allows me to shift the game window to the one connected via Intel UHD iGPU while maintaining operation on my AMD card.
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Mastera616
12-06-2021, 11:35 AM #6

Based on my observations, it seems the specialized GPU could be transmitting video data to the integrated graphics unit, which then forwards it to the screen. There could be issues such as delays or inconsistent frame rates, but it might function properly. My motherboard supports multiple monitors with iGPU, and linking two monitors allows me to shift the game window to the one connected via Intel UHD iGPU while maintaining operation on my AMD card.

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Mali249
Member
68
12-10-2021, 02:18 PM
#7
Thank you for the input. This appears to be the sole explanation that makes sense.
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Mali249
12-10-2021, 02:18 PM #7

Thank you for the input. This appears to be the sole explanation that makes sense.

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Joncus
Junior Member
18
12-18-2021, 06:42 AM
#8
Hey, necro post, but yes it can utilize the dedicated GPU through a motherboard port. Refer to this article: https://www.anandtech.com/show/1758...-r...high-end/3
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Joncus
12-18-2021, 06:42 AM #8

Hey, necro post, but yes it can utilize the dedicated GPU through a motherboard port. Refer to this article: https://www.anandtech.com/show/1758...-r...high-end/3