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Shouldn't onboard graphics & pcie card both work

     
12:07 am on Oct 31, 2013 (gmt 0)

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this computer has onboard graphics (ASUS M4A78LT-M-LE) and i've just installed a pciexpress graphics card - radeon HD5450.

the new card works fine but the onboard graphics now doesn't work, it worked fine before - i should have thought i could run the two simultaneously?

do i have to change a BIOS setting or something to get them both working?

previously in another computer, i've had 2 pci graphics cards installed and both worked together just fine (both with twin heads and thus 4 monitors, although i only used 3), so i'm a bit confused as to why the onboard graphics seems to not work now, the reason i got the card was so i could use three monitors, i was using 2 before both onboard graphics outputs.
10:10 am on Oct 31, 2013 (gmt 0)

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... to answer my own question ... after a fair bit of research it seems you can't use on-board graphics and a pci-express card at the same time, however you can use either with regular pci graphics cards. (i think there could be the odd exception with specialist motherboards)
8:34 pm on Nov 4, 2013 (gmt 0)

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it seems dual headed cards make the onboard a no go.

most of the time single output cards still allow you to use onboard.... it is still completely guess work though.
 

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