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HD 4000 + ATI 6850 For triple display

PG Studio

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Hi Guys,


I Installed Mavericks 10.9.2 yesterday from scratch and set my Internal GFX (HD 4000) (My Motherboard is: GA z77m-D3H) as the first boot option and everything work out of the box.

No boot flags, triple display running already at the instalation screen. Everything were smooth.


The only problem i have is that when I did a OpenGL test with Cinebench, it was using my HD4000 to perform the tests instead of ATI (and i was not able to change this) and the results were very low.


I play some games and that's why I want the ATI power.


When I set my ATI to be the first boot option in BIOS (and leave the HD4000 as the 2nd), My system doesn't boot. (it goes far in the boot process, but hangs somewhere (right before the login screen i think)).

I tried using GraphicsEnabler = No And Yes, PCIRootUID = 0 and still no go.


If I disable the Internal GFX in the BIOS, my system boots ok with no problem (using GraphicsEnabler = No) and using only the ATI card with 2 monitors.


Any idea how should I make the ATI the "primary" video card and the HD4000 as the secondary ?


Thanks for any help!



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