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What does bios setting 'iGFX =primary output' do?

bwana
Level 10

‎07-06-2023 05:11 AM

X670 E crosshair and 7800x3D and 4090. latest bios. Primary video output can be set to iGFX or PCIE video. I do not understand what the difference is between assigning 'Primary video output' to one or the other since all outputs work after boot. I am guessing the 'primary output' is where the bios screens show up. But why IGFx primary is necessary to get all video outputs to work after boot is unclear. If PCIE is set to primary, the motherboard video does not work unless I connect the hdmi cable to the motherboard hdmi after boot.

Intel 3770K 4.4ghz, 1.24v. . . . . . . . . . . . . .Intel 4930k 4.7ghz 1.37v........AMD 7800x3D async 104
32 gGSkill DR3Trident 2400mhz 1.65v. . . .32 g 1866 Vengeance Pro.......64 g Hynix 6200
ASUS M5G. Noctua D14. . . . . . . . . . . . . . . H110. Noctua A14x4.............Arctic 420
prime95 stable 78degrees. . . . . . . . . . . . . IBT 75 degrees
OCZ V4 OS. . . . . . . . . . . . . . . . . . . . . . . . . EVO 1TB...............................WDSN850x 2TB
Seasonic 700w. . . . . . . . . . . . . . . . . . . . . .1200AX.................................HX1200i
All tucked into Lian Li A05. . . . . . . . . . . . . .Fractal Midiv2......................BeQuiet802
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Silent_Scone
Super Moderator

‎07-06-2023 11:16 PM

The setting pertains to initialisation, so before OS handoff. Can aid with troubleshooting 

13900KS / 8000 CAS36 / ROG APEX Z790 / ROG TUF RTX 4090
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Seabee_2
Level 9

‎07-08-2023 09:53 PM

Quoted " But why IGFx primary is necessary to get all video outputs to work after boot is unclear. If PCIE is set to primary, the motherboard video does not work unless I connect the hdmi cable to the motherboard hdmi after boot."

 If you set ' Primary video output' to PCIE. Then the Primary VGA OR VIDEO makes the  GPU 4090 becomes the primary output source for signal to monitors. And is initialized first before any on board video that the mother board may or may not have installed as per chip set. Since the Crosshair X670E Extreme is capable of using the USB C Ports to output video that is why there is the choice of igfx or PCIe. IF you look into the Windows Device manager you should see two Display adaptors for the Crosshair Extreme the Nvidia RTX 4090 and a AMD Radeon Graphics. I have mine set to the PCIe setting in bios because the RTX 4090 is capable of operating 4 monitors by itself according to specs. There are three DP 1.4 ports and two HDMI  with one other port for VR usage. If you are not using the DP you are leaving performance on the table unused.  I am pushing two 32 inch  2560x1440 at 165hz monitors with DP and have yet to tax the GPU according to the Thor Power supply read out I have yet to draw more than 389 watts while gaming. 

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