0

When run Time Spy the laptop display, even if 2 external 4k monitors are enabled (with nothing happening on them) I still get a 3D Mark score of around 9500.

If I disable the internal monitor and other external monitors and just run TimeSpy on 1 4K display I get around 8000.

I've run this multiple times and it's always the same, no major other processes are running.

Any idea why this might be? According to this link this should not happen: https://support.benchmarks.ul.com/support/solutions/articles/44001789016-does-my-desktop-resolution-affect-my-3dmark-score-#:~:text=The%20rendered%20frames%20are%20then,the%20desktop%20resolution%20you%20use.

Thanks

niico
  • 255

1 Answers1

1

Your laptop has video outputs wired to a different GPU than the one you're running 3DMark on. The internal display, on the other hand, is wired to that GPU. The usual setup on laptops with higher-end graphics would be internal screen wired to the integrated GPU and video outputs to the dedicated GPU.

In this configuration if 3DMark is running on a display that the screen is wired to, then entire PCI-e bandwidth is available for 3DMark. However if the display is connected to a different GPU, then rendered frames have to be sent from the rendering GPU to the displaying GPU. That consumes part of the PCI-e bandwidth. Ironically the more frames you get, the more bandwidth (and thus frames) you lose - it's a negative feedback loop.

15% performance loss is roughly what you should expect based on the results of eGPU folks.

gronostaj
  • 58,482