Optiplex 990 Multi-Display settings in BIOS


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Optiplex 990 Multi-Display settings in BIOS

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does anybody know what the bios setting "Video" -> "Multi-Display" -> "Enable Multi-Display" effect? It just says "This option enables or disables Multi-Display. It should be enabled for Windows 7 32/64-bit only. This feature is not applicable to other operating systems."

By default its disabled.

I am using a HD 6450, not the onboard video.


Thank you


All Replies
  • I had this same question and here is the answer from a Dell support chat:

    ... this model does something different from our other systems in regards to onboard video and video cards.If you have that setting enabled, and a video card installed, and you're running Windows 7 with both drivers installed, you can use both the onboard video and the additional card

  • When  combining a dual monitor card with the integrated video port offer the ability to run a three-monitor set up? I have tried to install two video cards to set up a three monitor set up and it failed.

  • All this means is that you can use the displayport and vga at the same time for 2 different monitors.  I have a ATI 6670 and it completely disables the onboard intel video.

  • We are trying to run 3 monitors from an Optiplex 990.   Did this solution work?   I've tried installing 2 cards for the ability to run 3 monitors with no luck.  I can run 2 monitors from a single card plugged into the primary PCI express slot, but every time I plug in the second card into the PCI express slot #2 all three monitors go blank.

    If I can use the on board video along with a single card, we can live with it.  What are the required settings?

    I've also thought of purchasing a triple monitor capable card for my next step if the onboard and single card setup does not work.

    Any help will be greatly appreciated.

  • Cant use onboard with x16 video  get an ATi card with eyefinity and some mini display port adapters.

    While Eyefinity is a fantastic tool, it does have a couple major drawbacks in a budget-oriented environment. The most significant restriction is mandatory DisplayPort use. In a triple-display setup, at least one monitor must use the card's DisplayPort output. If one of the displays doesn't have a DisplayPort input, the user must purchase an active DisplayPort to HDMI/DVI/VGA converter in order for it to work. The active part is key because it means a low-cost passive converter won't work. Unfortunately, most active DisplayPort-to-HDMI/DVI converters seem to be in the $100 range.


    Report Unresolved Customer Service Issues here
    I do not work for Dell. I too am a user.
    The forum is primarily user to user, with Dell employees moderating.

  • Maybe you have the same problem I had.  I have the Two DUAL HD 6350 cards and found there is a setting called CrossFire that is on by default.  When I turned it off I was able to connect monitors to both cards.

  • Where is the switch setting?

  • It is in the Catalyst Control Center.  There may be other ways to get there, but here is how I found it.


    1. From the Catalyst Control Center Start Screen choose Performance - AMD CrossFire.

    2. Un-check "Enable CrossFire."

  • A different approach would be.

    J 5 Create JUA 230 DVI Display Adapter | Staples®


    Operating System

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    Minimum System Requirements

    Available USB 2.0 port
    1~2 Displays CPU: Intel/AMD Dual Core 1.8GHz processor,
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    RAM: 4 GB memory or higher

    Product >> USB Display Adapter >> JUA230


       - Resolution up to 1920×1200

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       * • Supports display resolution:1920 x 1200 @ 32bit

       * • Plug-and-Play USB connectivity

       * • Allows for up to 4 adapters in Windows

       * • Allows for up to 2 adapters in Mac

       * • Supports Display Modes: Primary, Extended, Mirror

       * • Display Rotation: 0°, 90°, 180°, 270°

       * • Aluminum enclosure that is non-toxic and recyclable

       * • Easy driver install

       * • Friendly software:

             o - Identify Monitors

             o - Multi-Display Control Panel

             o - Shortcut to access Windows

             o - Display settings dialog box

    Report Unresolved Customer Service Issues here
    I do not work for Dell. I too am a user.
    The forum is primarily user to user, with Dell employees moderating.

  • I have an Optiplex 390 with an integrated intel video card and an ATI HD 6450 PCI x16 card, and have enabled that BIOS setting.  After a reboot, the computer installed drivers for the integrated Intel card.  It complained that my ATI drivers were not functioning.  With another reboot, all three lit up and work very well.  I highly recommend three of the same monitors though so the color schemes and such look the same.

  • Did you ever get this working? I am having the same problem and I have disabled cross fire.

  • The Optiplex 990 works for me (on Linux) to run 3 monitors from one add-in PCIe video card plus the onboard Intel video.

    I have Optiplex BIOS A05.  I believe I enabled the video Multi-Display setting to get this working.

    The add-in PCIe video card is not one from Dell, it is 3rd party nVidia Corporation GT218 [GeForce 210]  (unsupported by Dell).

    We have another Optiplex 990 with BIOS A13 that does not seem to have a "Multi-Display" choice or a video menu, we have not yet determined if that system will work.  The user is actually trying to run two PCIe cards + the onboard Intel for 5 monitors total.

    - Dan Stoner

  • Hi,

    You can have both the PciExpress card and the Onboard video working in tandem.

    I just did. : My PC is Dell Optiplex 990, Mini tower, Intel i5-2400 3.10Ghz, 8Gb Ram. Windows 7 Professional 64 bits

    Video Card ATI Radeon HD 5450 (4292MB)

    1 - you probably have the ATI driver installed since it came with Dell base settings, but boot with PciExpress monitor(s) plugged in just to be sure.

    2- reboot, go to turn on the bios multi monitor option

    3- boot with only the onboard monitor: make sure you have the intel drivers  installed 

    4- reboot with all your monitors connected.

    I have 2x23" on the PciExpress card (via the 2xDVI dongle) and 1x17" on the mother board via the VGA connector.

    It even seems like I can put something else on the Display port... but I didn't try.

    Hope it works for you too.


  • I have a triple monitor set up working on a Optiplex 990 with an ATI card and the integrated DP in windows 8.1, but how did you get it to work in Linux? I am having trouble with it. I can only get the two video card monitors to show.

  • I started with the nvidia-settings GUI to create a base xorg file.  Then I tweaked it and added the third monitor for Intel integrated graphics manually.  Using Xinerama features.

    I had to modify the configuration at least once due to changes in the binary nvidia drivers. The distro was probably Ubuntu 12.04. There have been a lot of changes to the graphics layers in newer Ubuntu so not sure if this config would still work.

    Below is a pastebin of my xorg config. I copied and pasted from my email archive since I don't have access to the live machine anymore.

    3 monitors total: two widescreens rotated into portrait mode,  one normal monitor


    Good luck!