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Onboard MA785GM-US2H ATI HD 4200 video + Nvidia 9800 GT doesn't work

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January 13, 2010 3:59:41 AM

I'm trying to setup a third monitor on my system. I was in hopes that I could use the onboard ATI HD 4200 video chip along with the 9800 GT video card I have. This does not appear to be the case. I can only get the onboard video or the PCIE card to work, but not both. If I replace the Nvidia 9800 GT with an ATI card will that allow the onboard to work as well, or do I need to get either a quad display card or a motherboard that will accept a second PCIE video card?

I'm running Windows 7 32 bit, have a phenom II 955 X4 proc with 4 GB of RAM. Gigabyte MA785GM-US2H mobo. 9800 GT video card.
a c 106 U Graphics card
January 13, 2010 3:48:35 PM

The onboard video should disable itself if it detects a non ATI card in order to avoid potential issues. Check the BIOS to see if your board has the option to force the onboard video to be enabled. As for if you can use an ATI card and the onboard video, it all depends on what your BIOS will allow. Contact Gigabyte support to find out :D .

January 13, 2010 3:55:10 PM

I concur with Megaman on this one... just this week at work I observed a PC disable its onboard Intel graphics when I installed a low profile ATI 2400 XT card in it (don't laugh at the card... we just needed a low power, low heat card that supported multiple monitors)
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a c 140 U Graphics card
January 13, 2010 4:34:43 PM

I believe Nvidia drivers prevent you from useing a non nvidia adapter when it is installed. That is why it works with 2 ATI's and not 1 ATI and 1 Nvidia. I believe this used to work, but Nvidia modified there drivers.
January 13, 2010 6:52:29 PM

Yeah, I noticed when they are both enabled the onboard vieo works until windows starts up then the video card will come on instead. I've gotten it to do it the other way around before to, video card first then the onboard takes over when windows starts.


So if I get a dual output ATI card to replace my Nvidia I should be able to use three monitor at once?
a c 140 U Graphics card
January 13, 2010 6:56:13 PM

^ Correct

There is also a work around to allow an Nvidia card to run with an ATI card for PhysX, but I don't know if it will work as a display.

October 10, 2010 8:09:22 PM

I have an Hp Pavillion p6677cb that has the onboard ATI 4200 HD. I installed the Nvidia 9800 GT (512mb) but the computer will not see it. The Startup does show PCIE instead of Onboard so how do I get the board to wake up? When I try to install Win 7 64b drivers from Nvidia, it will not finish the install and says no drivers found? I'm confuused now!?
December 13, 2010 10:42:30 AM

windows 7 pro
phenom II x4 BE
MSI 785GT-E63 mobo.....ati HD4200 chipset
4gb Kingston DDR2 Hyper X 800Mhz
Ultra 850w PS
Sapphire Radeon HD 5970 Video Card - 2GB GDDR5, PCI-Express 2.0, CrossFireX Ready, Dual DVI, Mini Display Port


I want the same setup but no display from the onboard video.....I know my monitor works i had it hooked up on my last sytem

hopefully someone knows how to fix this problem
thanks and good luck
a c 271 U Graphics card
December 13, 2010 11:19:18 AM

This topic has been closed by Mousemonkey
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