GPU in a pcie 3.0 x1 slot on monitor output performance

[mu7x]

The PCI-E bus is used to communicate with the graphics card.

So does this mean that connecting a GPU in a PCI-E 3.0 x1 slot would not affect the monitor output at all ? Is there any impact of the PCI-E bus' bandwidth or throughput on the video output to a monitor?

 

[mu7x]

After more thorougly searching (I didin't find a relevant link search before hand) this answers my question: https://hardforum.com/threads/4k-gaming-vr-at-120-fps-requires-pcie-4-0.1935630/
sorry for the noise

The pcie bus has no impact on the video output. If I then understand things correctly, the main thing to be careful about is the video connector can support the bandwidth from the gpu to the monitor.

 

[rhansen5_99]

Here is probably what you want https://www.techpowerup.com/reviews/NVIDIA/GeForce_GTX_1080_PCI_Express_Scaling/24.html

Dropping from 3.0 16x to 1x or similar to 4x pcie 1.1 is really only a 30% hit on a 1080 GTX ... Of course you will need to get the 75w from the bus in another way

 

[mu7x]

Thanks rhansen6_99, I was actually interested if there were any issues in displaying video output when dropping to slower pci-e bus speeds (i.e. 4k 10bit monitor output on a slow bus x1 bus). I mistakenly thought that it would affect video output (it will however affect gaming performance since that involves moving data from memory to the gpu through the pcie-bus, which is limited by the bus speed). Video output to the monitor from the gpu needs to have a suitable cable to support the bandwidth, but the bandwidth of the pcie-bus is not related.

 

[rhansen5_99]

Hey sorry I missed what you were asking, but yes you are right. The 1x pcie 3 can move data about 1gb per second and a 4k60 display requires about 500M pixels per sec ... So even at 10bit with some fuzzy logic you should be pretty safe within the potential.

 

[defaultluser]

Hey sorry I missed what you were asking, but yes you are right. The 1x pcie 3 can move data about 1gb per second and a 4k60 display requires about 500M pixels per sec ... So even at 10bit with some fuzzy logic you should be pretty safe within the potential.

And to be more clear: the bandwidth used by the video card to output data is significantly less because it's processing compressed data.

Compressed instructions to render the colorful desktop (2D or 3D).
Compressed textures for all the bitmaps.
Compressed video, which is rendered in hardware on the video card.

So the end slot bandwidth required to create a scene on your desktop is tiny. The DisplayPort or HDMI connection is the one tasked with handling the highest-bandwidth job displaying the Windows desktop, since it's fully-rendered and uncompressed.