I have a Geforce GT 640 and I'm thinking of running dual monitors on my system. I have two VGA monitors, and I'm aware that I have two DVI-D's and an HDMI port on my card, which I would not buy adapters for it. Can I extend my desktop with integrated graphics enabled? And if i'm gaming, would it only display on the monitor where it's connected to my GPU? I don't mind gaming on one screen.

EDIT: My motherboard is a Gigabyte H61M-S2P

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    We would need to know what motherboard you have. Most motherboards turn off the onboard video once it detects a video card. – Unfundednut Aug 12 '15 at 2:54

Technically, yes, but be ready for some instability problems.

Many motherboards will automatically disable the internal graphics when one connected to the x16 slot is detected. Most also allow one re-enable the option.

I don't own a GB motherboard so the instructions are a little bit generic.

  1. Restart your computer into your BIOS, whether it be CMOS or UEFI.
  2. Go to the Options tab
  3. Use your arrow keys to navigate to the Video selection.
  4. Select the graphics option and select IGD or Integrated
  5. Save and Reboot.

I personally use a similar setup, and can verify that it works on Windows 10. Screen mirroring isn't available but usually isn't needed.

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