Why won't Fallout New Vegas use my graphics card?

[ProbablyArmed]

I have a Radeon R9 280, but it won't show up in the options! Instead I just get the shitty NVIDIA GeForce 7900 GS which came with my processor. How can I fix this?

 

[holyprof]

Did you remove the old card from the PC? Did you uninstall the Nvidia drivers?

If it's an integrated graphics processor, you need to enter the BIOS and tell it to use the dedicated GPU (R9 820) instead of the integrated one.

 

[ProbablyArmed]

Did you remove the old card from the PC? Did you uninstall the Nvidia drivers?

If it's an integrated graphics processor, you need to enter the BIOS and tell it to use the dedicated GPU (R9 820) instead of the integrated one.

It is an integrated graphics processor. Could you give me a more detailed explanation on how to do that? I'm a noob, you see.

 

[rgd1101]

connect your monitor to the r9 280

 

[holyprof]

connect your monitor to the r9 280

Yep, might be that. Did you connect the monitor to the newly installed graphics card?

In case you did, you might need to configure your motherboard to use the R9 280. It is done in the BIOS. To enter the BIOS configuration press the corresponding key immediately after you turn computer on. The key is different for different models but usually is one of these: Del, F2 or F10. Would help a lot if you can tell what is your motherboard model.
It is also possible that you have both cards active but windows is configured to use the integrated.