Asrock A75 Pro4 用户手册

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3.4.2  North Bridge Configuration

  This item will switch the PCI Bus scanning order while searching for video 

card. It allows you to select the type of Primary VGA in case of multiple 
video controllers. The default value of this feature is [PCI Express]. Con-
  guration options: [Onboard], [PCI] and [PCI Express].

This allows you to set the share memory feature. The default value is [Auto]. 
Configuration options: [Auto], [32MB], [64MB], [128MB], [256MB] and 
[512MB].

This allows you to enable or disable the “Onboard HDMI HD Audio” fea-
ture. 

This item appears only when you install AMD RADEON HD6670 / 6570 
/ 6450 graphics card on this motherboard. Use this to enable or disable 
Dual Graphics feature. If you enable this option, the primary monitor will 
be onboard VGA. If you select [Auto], Dual Graphics function will be auto-
matically enabled when you install AMD RADEON HD6670 / 6570 / 6450 
graphics card. The default value is [Auto].

Use this to select DVI function when you install the DVI to HDMI adapter 
to DVI port. Con  guration options: [as Dual Link DVI] and [as HDMI]. If you 
select [as Dual Link DVI], you can use Dual Link DVI monitor without au-
dio function. If you select [as HDMI], you can use HDMI monitor with audio 
function. The default value is [as Dual Link DVI].