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HP Compaq Business Desktop PCs - Installing PCI, PCI Express x1, PCI Express x16, and ADD2 SDVO PCIe Graphics Card on Desktop PCs with Intel Integrated Graphics Controller

If an external graphics card is installed in a PCI or PCIe x1 slot, the internal graphics can be enabled or disabled using the system's BIOS setup utility.

If a graphics card other than an SDVO/ADD2 card is installed in the PCI Express x16 slot, the internal graphics cannot be enabled.

Information

Display configurations of on-board Intel graphics with external graphics card
External Graphics Card Type
Integrated Intel Graphics Status
Details
Multiple Displays
PCI Graphics Card
Integrated Graphics can be enabled or disabled in F10 Setup only after installing the PCI Graphics Card, hence it works together with VGA.
One, two or three PCI graphics card or cards can be installed depending on the number of vacant PCI slots and PC form factor, such as CMT, MT, SFF, and USDT.
Yes, it depends on the PCI card ports plus on-board VGA
PCIe x1 Graphics Card
Integrated Graphics can be enabled or disabled in Device Manager to work together with PCIe x1 Graphics Card.
One or two PCIe x1 graphics card or cards can be installed depending on the number of vacant PCIe x1 slots and PC form factor, such as CMT, MT, SFF, and USDT.
Yes, it depends on the PCIe x1 card ports plus on-board VGA.
PCIe x16 Graphics Card
Integrated Graphics cannot be enabled in F10 Setup after installing the PCIe x16 Graphics. It will automatically disable VGA.
One PCIe x16 graphics card can be installed in a PCIe x16 slot, and for some PCs PCIe x16 slot it also functions as SDVO slot but not for all PCs(for instance, dx2400 or dx2450).
Yes, it depends ONLY on the PCIe x16 Card.
ADD2 SDVO PCIe Graphics Card
Integrated Graphics will be available after installing the ADD2 SDVO graphics card, hence it works together with VGA.
In most PCs, the SDVO slot will also support PCIe x16 card, but not all of them. SDVO slot will not support PCIe x16 graphics card, even though, the slot looks similar to PCIe x16 slot. (Example: dc5700)
Yes, ADD2 card port (DVI-D or VGA) plus on-board VGA.

Other display configurations:

PCIe x16 graphics card plus one or two PCIe x1 graphics cards will work together.

Independent of on-board VGA (on-board disabled), up to three PCI graphics cards will work together.

Independent of on-board VGA (on-board disabled), up to two PCIe x1 graphics cards will work together.

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