Member Avatar for chopficaro

i heard rumors that if u are dual wielding monitors and playing a heavy game on one monitor, and you have the slightest bit of graphic processing on the other monitor, your game will lag tremendously. is this true? why?

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The question from drew different experiences from , and . There is no single yes/no answer: whether dual monitors slow a game depends on what the second display is doing, how the OS and drivers compose the desktop, and whether a multi-GPU topology is in play. The advice below explains how to diagnose real bottlenecks and which simple changes usually fix the issue.

Common causes and a short troubleshooting checklist:

  • Desktop compositing and extra pixel fill: the compositor (Aero/DWM on older Windows, compositor on other OSes) can add GPU work. Test with the compositor off or run the game in exclusive fullscreen.
  • Active content on the second display: video playback, live previews, browser pages with CSS/Canvas, or streaming on the second monitor add real GPU load.
  • VRAM and resolution: an extra high-resolution display consumes memory and fillrate; monitor VRAM usage while testing.
  • Refresh-rate/resolution mismatches: mismatched timing can force extra work; match rates when possible.
  • Multi-GPU/driver behavior: some multi-GPU setups change rendering paths when multiple displays are attached; check vendor documentation or test with one display only.

Practical steps: measure FPS with only the primary monitor, then enable the second monitor idle, then enable GPU-heavy content on the second monitor to see where drops occur. Use a GPU monitor (vendor tools or GPU-Z/MSI Afterburner) to watch utilization and VRAM. Typical fixes: run the game in exclusive fullscreen, stop GPU-heavy apps on the second display, match refresh/resolution, or run the game on the primary GPU only. Modern single GPUs usually handle two monitors fine when the second display is idle; large slowdowns point to extra workload or driver/multi-GPU topology rather than an absolute hardware law.

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Member Avatar for madoverclocker

this is true for SLI rigs because SLI is turned off when dual monitors are used. something to do with windows display programming...

Member Avatar for jbennet

this is true for everything as your gpu has to basically half itself

Member Avatar for joytech22

not really, the GPU doesnt suffer much if the games configuration is set for multiple display enhancement in Nvidia control panel.

i only have one 9800GTX and it runs perfectly with dual displays while gaming.

but with SLI (2 GPU'S in 1pc) one tends to turn off.

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